Mint in Zone 9 -- plant

Subzone	Last spring	First fall	Growing days	Winter min	Fruits reliably
9a	Mar 8	Nov 24	~261	20-25°F	Yes · two seasons
9b	Feb 28	Nov 30	~275	25-30°F	Yes · two seasons

In a pot

Yes, 2 gallons and up

A pot is the best way to grow mint, because it keeps the roots from running all over the garden. Use a container at least 8 inches deep, keep it watered, and snip sprigs often. It is happy on a partly shaded step or windowsill and comes back year after year.Containers are the standard way to grow mint, because they cage the aggressive rhizomes that otherwise colonize a bed; Maryland, UF/IFAS, and Wisconsin all recommend potting mint or using a bottomless sunken container to confine it. Use a pot at least 8 inches deep and keep the mix steadily moist, since pots dry fast and mint has little drought tolerance. Divide and repot every year or two when the clump crowds itself, and cut back after frost for a clean flush in spring.

Pot size: 2 gallons and up; 3 gallons is comfortable
Mature size: 12 to 24 inches tall, 12 to 24 inches wide
Drainage: Drainage holes are a must. Skip the gravel layer. Empty the saucer after watering so the roots stay moist but never sit in standing water, which invites rot.
Watering: Pots dry out fast and mint hates drying out, so check daily in warm weather and keep the mix evenly moist.Containers dry faster than beds and mint will not tolerate drying out, so check daily in warmth and water before the mix dries.
Depth and shape: At least 8 inches deep. Depth matters less than confinement: a pot 8 inches or deeper holds enough moisture, but the real job of the container is to wall off the running rhizomes, so choose a solid-sided pot rather than a fabric bag if you plan to sink it in a bed.
Self-watering pot: Yes. A self-watering container suits mint well, since it smooths out the steady moisture the plant wants and reduces the drought stress that brings on spider mites.
Mix: A moisture-retentive potting mix with plenty of organic matter, since mint likes to stay damp. Blend in compost for water-holding and a little balanced starter fertilizer; do not overdo the nitrogen or the plant flops.
Feeding: Container mint needs a light but regular feed, a dilute liquid fertilizer every 3 to 4 weeks, because frequent watering leaches the limited mix; keep nitrogen modest to preserve flavor.

One to try

Chocolate mintA peppermint selection with a dark stem and a cocoa-and-mint aroma; popular for desserts and drinks. Grown from cuttings or division.

4 more compact types

Spearmint

Peppermint

Apple (woolly) mint

Mojito mint

Winter

Mint is very hardy and comes back every spring, but a pot freezes harder than the open ground because the roots are exposed on all sides. In cold areas, sink the pot in the ground for winter, move it against the house or into an unheated shed, or mulch over it. Cut the top back after frost; it will resprout from the roots in spring.Mint is a hardy herbaceous perennial (Utah State rates it hardy to about -20°F), so a container overwinters readily, but the confined root ball is more exposed to freezing than in-ground crowns. In cold zones sink the pot, move it to a cold frame or unheated structure, or heap mulch over it; the top dies back and regrows from the roots and rhizomes in spring. This is also the moment to lift, divide, and refresh a potbound clump.

Pot safety

Ask what your balcony or roof can carry

A balcony or roof can only hold so much weight. Before you set heavy pots there, ask a building architect what it can safely carry.Illinois Extension's guidance is to consult a building architect about weight limits before placing heavy pots on a balcony or rooftop garden. It gives no weight figure.

Never grow food in a container with anything toxic in it

Many kinds of containers can be used. Whatever you choose, keep anything toxic out of it, especially if you are growing food.Colorado State accepts nearly any container material but warns against using a container that holds toxic materials, especially for edible plants. Illinois adds that a vegetable container should be free of chemicals toxic to plants or people, and urges caution with treated lumber when growing food. If you cannot account for what a repurposed container once held, that alone is a reason to keep food out of it.

Secure hanging containers well

Fasten hanging baskets and window or rail boxes securely. Think about what is below them too, since they can drip on people or things underneath.Illinois Extension asks growers to secure hanging containers well and to think through the safety issues of hanging them. Placement matters too, since a hanging container can drip onto people or belongings below.

Soil chemistry

Soil pH for mint

Preferred

6 to 7

Tolerated

5.5 to 7.5

Mint grows best in slightly acidic to neutral soil, about 6.0 to 7.0, and it is not fussy. Most garden soil is fine; a simple soil test tells you where you stand.Aim for a soil pH of about 6.0 to 7.0, slightly acidic to neutral. Utah State describes mint as preferring slightly acidic soil, NC State lists it as tolerant across roughly 6.0 to 8.0, and the University of Minnesota's general herb guidance is a well-drained soil near 6.0 to 7.5, so mint is forgiving and rarely needs any pH adjustment beyond a soil-test baseline.

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Steady hand on the hose

Watering

When & how much

Frequency

Water often enough to keep the soil evenly moist, about 1 to 2 inches a week. Mint likes damp soil, so do not let it dry out.Roughly 1 to 2 inches of water per week, kept even; mint is a moisture lover that must not dry out, and Utah State advises 1 to 2 inches per week while cautioning against overwatering, which invites disease.

Amount

Aim for about 1 to 2 inches a week, more when it is hot or in a pot. Keep the soil damp but not swampy.About 1 to 2 inches per week, more in heat and in containers, which dry fast; the goal is steady, even moisture rather than a soak-and-dry cycle. Mulch helps hold it.

Method

Water at the base of the plants rather than over the leaves, which helps prevent the leaf diseases mint is prone to.Water at the soil line with drip or a soaker hose; keeping the foliage dry checks mint rust, powdery mildew, and leaf spot on a crop eaten fresh, which Utah State reinforces with its drip-irrigation and no-overnight-wet-leaves advice.

Signs of trouble

Too much water

Lower leaves yellow and the plant can rot at the base if the soil stays soggy, and wet leaves bring on leaf diseases.Yellowing lower leaves and root or crown rot in ground that stays waterlogged, plus more rust and mildew where the foliage stays wet; mint tolerates damp soil but not standing water.

Too little water

Wilting, dull leaves and more spider mites when the soil dries out. Mint does not handle drought well, so keep it watered.Wilting, dull or bronzed leaves, and a spike in spider mites; sustained drought stress checks growth and, in hot dry regions, scorches the foliage, since mint has little drought tolerance.

Feeding rhythm

Feeding

Frequency

Once or twice per season

Type

Balanced granular fertilizer

When to start

a light feeding in early spring as growth resumes, with a second light feeding midseason only if the patch looks pale

Mint does not need much feeding, and too much makes it flop and lose flavor. Mix a little compost or balanced fertilizer into the soil in spring, then leave it alone. If you grow it in a pot, feed lightly with a diluted liquid fertilizer every few weeks, since watering washes nutrients out.Mint is a light feeder and is easily overfed. Utah State suggests about one teaspoon of a balanced 16-16-16 fertilizer per plant in early spring as growth resumes; a compost-rich bed often needs no more than a light topdressing. Go easy, because rich soil and heavy nitrogen push soft, floppy stems and thin the essential oils that carry mint's flavor and aroma, a point Wisconsin Horticulture makes for mints grown in lean ground. In a container, where frequent watering leaches nutrients, a dilute liquid feed every few weeks through the growing season keeps the leaves green.

N · P · K = 16-16-16

Use a balanced fertilizer such as 16-16-16, just a light feeding in spring. Do not overdo it; too much makes mint floppy and bland.A light, balanced feed is all mint wants: about a teaspoon of 16-16-16 per plant in early spring, or a compost topdressing. Avoid heavy nitrogen, which makes the stems floppy and waters down the flavor.

Try 16-16-16 or a balanced all-purpose fertilizer, or a topdressing of compost

Who grows well together

Companion planting

Mint has a real gift and a real hazard as a companion. Its strong scent is said to confuse pests like cabbage moths, aphids, and flea beetles, and when it flowers it draws in bees and helpful insects. The hazard is that mint spreads so aggressively it will smother its neighbors, so the golden rule is to grow it in a pot, even when it is near the plants it helps. Keep it away from chamomile and other quiet herbs it would overrun, and away from your other mints so the flavors stay distinct. Mint's companion value is mostly aromatic and pollinator-based: its volatile oils are traditionally credited with deterring cabbage moths, aphids, ants, and flea beetles, and a flowering patch is a strong nectar source for bees and predatory insects. The overriding practical fact, though, is its aggression, so any interplanting benefit is realized by sinking mint in a container next to the crop rather than letting it loose in the bed. The well-grounded cautions are structural: keep mint out of the open ground near less vigorous herbs (chamomile, and slower perennials) that it will overrun, and keep different mints separated to preserve their distinct flavors and to slow shared rust.

Other

Brassicas (cabbage, broccoli, kale)

Mint's strong smell is traditionally said to put off the cabbage moths and flea beetles that attack cabbage-family plants. Grow the mint in a sunken pot nearby so it helps without taking over.A traditional aromatic pairing: mint's essential oils are long credited with masking or deterring cabbage moths and flea beetles on brassicas. Sound by mechanism and tradition rather than a measured trial, and only safe if the mint is contained. Traditional

Tomatoes and peppers

Mint is often planted near tomatoes and peppers to help repel aphids and other pests with its scent, and its flowers bring in helpful insects. Keep it in a pot so its roots do not invade.A traditional aromatic and beneficial-insect pairing; the caution is that tomatoes, peppers, and mint share Verticillium, so a contained mint next to them must not later be planted into that soil. Traditional

Pollinators and beneficial insects (when flowering)

If you let some mint bloom, the flowers feed bees, hoverflies, and other good bugs that also eat garden pests. Let one contained clump flower for them.A genuine insectary function: a flowering mint patch recruits bees and aphid-eating hoverflies and parasitoids, the same mechanism extension services cite for flowering herbs. Realized best by letting one contained clump bloom while others stay cut. Well-grounded

Keep apart from

Other mints and quiet herbs (chamomile, marjoram) Do not plant mint loose in a bed next to gentler herbs like chamomile or marjoram, because mint will run over them. And keep different mints apart, or their flavors blur together and they trade diseases.The signature caution: mint's rhizomes overrun less vigorous neighbors, so keep it out of open ground beside chamomile, marjoram, and slower perennials. Separate different mints to preserve distinct flavors and to slow the rust that congestion spreads. Extension-supported (contain mint) rather than folklore. Research-backed

Provenance tagged inline · see methodology for the labeling system Key

Harvest signals

When to pick

Mint is ready to pick once the plants are a few inches tall and leafy, which happens fast. Snip sprigs whenever you need them, or cut the whole plant back by a third and it grows again. Pick in the cool morning for the best flavor, and cut it before it flowers, since the leaves get tougher once it blooms.Mint is ready to harvest once the plants are several inches tall and full, usually within weeks of establishing. Utah State picks when stems reach 3 to 4 inches and cuts two to three times a season, taking the stems to within about an inch of the soil; for everyday use, take sprigs or cut stems back by up to a third and the plant flushes again in a couple of weeks. Harvest in the cool morning for the best oils, and cut before or during flowering, since the leaves coarsen once it blooms.

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Yield

What to expect

One mint plant quickly becomes a whole patch and gives you more than you can use, so one or two plants are plenty. It comes back bigger each year.A single mint plant becomes a spreading patch within a season and, cut repeatedly, yields far more than a household uses; one or two contained plants supply a kitchen. Yield builds year over year as the clump thickens, which is also why division and renewal matter.

Mint produces from spring through fall, and almost all year in mild climates. Keep cutting it and it keeps coming.Production runs from late spring through fall in cold zones and nearly year-round in frost-free ones, dipping only in the hottest arid summers and in winter dormancy. Regular shearing keeps the flushes coming and the leaves tender. Mint is very easy to grow the first year. The only real mistake is not containing it. Plant it in a pot in moist soil, keep it watered, cut it often, and it comes back every year.Mint is one of the easiest crops to succeed with in year one, so easy that the beginner mistake is not failing to grow it but failing to contain it. Plant a division or cutting in moist, part-shade ground inside a barrier, keep it watered, cut it often, and it establishes fast and returns every spring for years.

What changes yield

Containment: the single biggest decision is a sunken bottomless pot or a lined bed, since uncontained mint takes over and becomes hard to remove.Even moisture and part shade: mint is a moisture lover with little drought tolerance and, unusually for an herb, tolerates and even wants some shade, especially in hot regions where full sun scorches it.Harvest and shearing: frequent cutting keeps leaves tender, prevents flowering, and forces fresh flushes all season.Renewal: dividing and resetting the patch every few years in clean ground restores vigor and outruns mint rust, verticillium wilt, and root pests.Restraint with fertilizer: rich soil and heavy nitrogen make floppy, less flavorful growth, so feed lightly.

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Pick your variety

Recommended varieties

Pick mint by how it tastes, since they all grow the same. Spearmint is the mild, sweet everyday mint and the easiest; peppermint is stronger and cooler. There are fun flavored kinds too, like chocolate, apple, orange, and mojito mint. Grow any of them from a cutting or a division, not from seed, because seed-grown mint is unpredictable. And whatever you pick, give it a pot so it does not take over.Choose mint by flavor, since culture is nearly identical across the genus. Spearmint (Mentha spicata) is the mild, sweet all-purpose culinary mint and among the hardiest; peppermint (Mentha x piperita) is the stronger, cooler, menthol type and, as a hybrid, must be grown from cuttings or division rather than seed. Flavored selections such as chocolate, orange or bergamot, apple or woolly (and its variegated pineapple mint form), and mojito mint (Mentha x villosa) all grow the same way. Because named mints are hybrids or selections, Clemson notes mint seed does not come true to type, so propagate every one of these from cuttings, divisions, or transplants. Keep different mints apart if you want to preserve distinct flavors, and contain every one of them.

Spearmint (Mentha spicata)

The classic culinary mint, mild and sweet; the traditional choice for tea, mint juleps, tabbouleh, and lamb. One of the easiest and hardiest mints. Propagate from cuttings or division.

Peppermint (Mentha x piperita)

Stronger, cooler, and more menthol-forward than spearmint, with a candy-cane note; a natural hybrid of water mint and spearmint. Being a hybrid, it does not come true from seed, so grow it from cuttings or divisions.

Chocolate mint

A peppermint selection with a dark stem and a cocoa-and-mint aroma; popular for desserts and drinks. Grown from cuttings or division.

Apple or woolly mint (Mentha suaveolens)

Soft, fuzzy, round leaves with a fruity, mild apple-mint flavor; the variegated pineapple mint is a form of it. Tolerates some shade and is a bit less aggressive than spearmint.

Mojito mint (Mentha x villosa)

The traditional Cuban mint for mojitos, milder and less biting than peppermint, with a warm, almost bubblegum note. Grown from cuttings.

Orange or bergamot mint (Mentha x piperita citrata)

A citrus-scented peppermint form used in teas, fruit dishes, and drinks. Like other named mints it is propagated vegetatively, not from seed.

Off the vine

Storing your harvest

Room temp

Do not leave cut mint out on the counter, where it wilts. Chill it, or stand the stems in a glass of water like a little bouquet.Fresh-cut mint wilts within a day at room temperature, so refrigerate promptly; standing the cut stems in a glass of water on the counter holds them a few days, like cut flowers.

Fridge

Store fresh mint unwashed in a loose bag in the fridge, where it keeps about a week. Wash it only when you are ready to use it.Refrigerate fresh mint unwashed in a loose or perforated bag, or with the stems in a little water under a loose bag, in the crisper; it holds about a week. Wash only at use, since trapped moisture speeds breakdown and blackening.

Freezer

Freeze chopped mint in an ice-cube tray with a little water for drinks and cooking. You can also dry it, but dry it somewhere dark and dry or the leaves go dark and moldy.Mint freezes well chopped into ice-cube trays with water for drinks and cooking, or blended into sauces; frozen sprigs lose their crispness for garnish but keep their flavor. It also dries, but as UF/IFAS warns, dry it in darkness and low humidity or the leaves turn dark and moldy.

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From the garden to the kitchen

Recipes to try

Breakfast

Fresh Strawberry Overnight Oats

Breakfast · 5m · Serves 2

Baking & Desserts

Strawberry Shortcake

Baking & Desserts · 40m · Serves 8

Sides & Snacks

Zucchini Fritters with Yogurt

Sides & Snacks · 25m · Serves 4

More recipes

arriving with the harvest

When something goes wrong

Common problems

01 of 04

What happened Your mint escaped its spot and spread through the bed, popping up among other plants. That is mint being mint: it runs by rhizomes and stolons and, as Utah State puts it, once established it is very hard to eradicate. Next time, plant it in a pot or a bottomless container sunk in the ground, leaving an inch of rim above soil, and pull escaping runners while they are small.The patch colonized the bed through shallow rhizomes and stolons, the defining mint behavior every extension source warns about (contain it in a sunken bottomless container or lined bed). Runners left unpulled root at the nodes and become hard to eradicate. Next time confine at planting and edge the container above the soil line. Next season Grow mint in a pot or a buried, bottomless container, and pull stray runners early.Confine at planting in a sunken bottomless container (rim above grade) or a lined bed, and patrol for and pull escaping runners while young.

02 of 04

What happened Your mint leaves developed orange to rust-brown powdery spots, mostly on the undersides, and some curled and dropped. That is mint rust (Puccinia menthae). It overwinters in the rhizomes, so the patch reinfects itself, and crowding and wet leaves make it worse. Next time, thin and space the plants, water at the soil line, remove rusty leaves, and cut a bad patch to the ground; renew from clean cuttings in a new spot if it keeps coming back.Orange-brown pustules on leaf undersides, stems, and petioles with defoliation indicate mint rust (Puccinia menthae), favored by crowding, humidity, and leaf wetness and carried over in the rhizomes. Next time open the canopy, switch to soil-line watering, sanitize infected foliage, shear or mow a severe patch, and re-establish from rust-free stock in clean ground. Next season Space and thin for airflow, water at the base, remove rusty leaves, and renew badly infected patches from clean cuttings.Thin for airflow, irrigate at the soil line, remove infected leaves, cut back a severe patch, and renew from clean cuttings in a new site.

03 of 04

What happened Your mint leaves looked stippled, dull, or bronzed, maybe with fine webbing underneath, during a hot dry spell. Those are spider mites, and they thrive when mint is hot, dusty, and dry, exactly the stress mint hates. Next time, keep the soil evenly moist and mulched, hose off the leaf undersides, and give afternoon shade in fierce heat.A fine pale stippling with faint webbing on the undersides in hot, dry weather points to spider mites, which UC IPM lists for mint and which flare on drought-stressed, dusty plants. Next time maintain steady moisture and mulch, wash the undersides forcefully and repeat, conserve predatory mites, and provide afternoon shade in the hottest regions, since mint's moisture love is its best mite defense. Next season Keep mint evenly moist and mulched, rinse the leaf undersides, and shade it in extreme heat.Hold steady soil moisture, mulch, hose the undersides repeatedly, conserve natural enemies, and shade the plants in extreme heat.

04 of 04

What happened Your mint grew slowly with a bronze cast in spring, then lower leaves yellowed and whole stems wilted and died, often on one side, in warm weather. That is verticillium wilt, a soilborne fungus with no cure. Next time, do not replant mint in that ground and do not plant it where tomatoes, potatoes, or strawberries grew; start fresh cuttings in clean soil somewhere else.Slow bronze-cast spring growth, one-sided branch development, and lower-leaf yellowing with warm-weather wilt and dieback indicate verticillium wilt (a soilborne Verticillium), which Utah State and the Connecticut Experiment Station flag for mint. The fungus persists in soil for years with a wide host range, so there is no rescue. Next time re-establish disease-free stock in clean ground away from prior Verticillium hosts and renew the patch on a multi-year cycle. Next season Remove infected plants, avoid replanting mint or following tomatoes and strawberries in that soil, and start clean cuttings in a new bed.Rogue affected plants, propagate clean cuttings into clean ground away from tomato, potato, eggplant, and strawberry, and reset the patch periodically.

The usual suspects

Pests & diseases

Pests

Aphids

P · 01

Symptoms Clusters of tiny soft green or gray insects on the growing tips and the undersides of the leaves. Where they feed, the foliage curls, yellows, or stops growing, and the leaves can turn sticky with honeydew.Colonies build on the growing tips and leaf undersides, which is where Utah State puts mint's aphids; several species are involved rather than one, and soft, overfed growth carries the heaviest numbers. UC IPM's Pest Notes supplies the reason to catch them early: aphids can carry viruses from plant to plant. Cause Aphids are small sap-sucking insects that breed fast, especially on soft growth from too much fertilizer, and they can spread plant viruses.Several aphid species feed on mint; they reproduce rapidly and favor the lush growth that excess nitrogen and rich soil produce. Organic treatment Knock them off with a strong jet of water first, aiming up into the leaf undersides, and repeat every few days. If they keep coming back, insecticidal soap or a horticultural oil will work, but only where you can wet the undersides, and not on a plant that is dry at the roots or on a very hot day.Break the colonies up with a water jet before reaching for anything else, then treat with soap or a horticultural oil only if numbers hold, taking the undersides with a high volume of water and repeating. UC IPM's line is not to use these materials on a drought-stressed plant or when it is very hot. Lady beetles, lacewings, syrphid larvae and small parasitic wasps do most of the work if broad-spectrum insecticides stay off the patch. Prevention Welcome ladybugs and lacewings, go easy on nitrogen, and check new growth often.Scout the tips early, avoid overfeeding, and conserve natural enemies; because you eat the leaves, lean toward a strong water spray before anything else.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Balanced nitrogen feeding

Go light on feeding. A rich feed makes the plant throw out soft, juicy shoots, and those are the ones that end up covered in aphids. Mint does not need much anyway: you are picking it all season, and that is what keeps it in new leaf.Aphid reproduction tracks the flush, and UC IPM's rule is never to use more nitrogen than necessary. On mint the fertilizer is the part to hold back, because cutting the plant already keeps fresh growth coming without any help.
Water spray

Hit the plant with a forceful jet of water and knock the aphids off, working up underneath the leaves where the clusters sit. Look again in a few days and repeat if they are back.Lean on plain water before anything sprayed on a crop you cut and eat fresh; it is the one control both Utah State and UC IPM give for aphids in the same breath. UC IPM's monitoring interval is at least twice a week while plants are growing rapidly, which is what makes an early knock-back possible.
Beneficial predators

Lady beetles, lacewings, hoverfly larvae and small parasitic wasps will usually take an aphid run down for you. Broad bug sprays kill them along with the aphids, so leaving the patch alone is often the fastest route.UC IPM names those four groups as mint-scale aphid natural enemies and tells you to avoid broad-spectrum insecticides toxic to them. Conservation costs nothing and it is the reason a light infestation is usually worth watching for a week before it is worth treating.
Insecticidal soap

If the aphids hold on after repeated hosing, insecticidal soap will take them out, but it only kills what it lands on. Wet the undersides of the leaves, not just the tops, and expect to go again.Utah State names insecticidal soap for mint directly. Apply it in a high volume of water and cover the undersides, and respect UC IPM's two exclusions: not on a drought-stressed plant, and not when it is very hot.
Horticultural oil

A horticultural oil is the other choice at this level, put on the same way: thorough wetting, undersides included, and never on a plant that is dry at the roots or during a hot spell.UC IPM's application language for oils is a 1 to 2 percent solution in a high volume of water, targeting leaf undersides as well as tops. Like soap it kills only on contact, so a missed underside is a surviving colony, and the drought and heat exclusions are the same.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Spider mites

P · 02

Symptoms A fine stippling or speckling on the leaves, sometimes with faint webbing on the undersides, worst in hot, dry weather. Leaves look dull, sandy, or bronzed.Twospotted and related spider mites, which UC IPM lists for mint, stipple the foliage with pale flecks and spin fine webbing on the undersides; they flare in hot, dry, dusty conditions and on drought-stressed plants, which is why mint's moisture love is also its best mite defense. Cause Tiny sap-sucking mites, not true insects, that explode in hot, dry, dusty conditions and are easy to miss until the leaves are speckled.Spider mites feeding with piercing mouthparts; populations build fastest in heat and drought and on dusty, water-stressed plants. Organic treatment Spray the undersides of the leaves with a strong jet of water to knock the mites off, and keep the plant well watered, since drought stress is what lets them build. If they persist, insecticidal soap will work, but not on a plant that is dry at the roots and not above 90°F.Hose the undersides forcefully and repeat daily while it is hot, hold steady soil moisture, and treat with insecticidal soap only where you can coat the undersides, since these materials kill on contact and nothing else. Conserve whatever is already hunting them: UC IPM's Pest Notes names predatory mites, minute pirate bugs, bigeyed bugs and lacewing larvae, and its peppermint guidelines name a predatory mite released on mint itself, Neoseiulus fallacis. It also reports that spider mites frequently become a problem after an insecticide has been applied. Prevention Keep mint evenly moist and mulched, since drought stress invites mites, and rinse dusty foliage in hot spells.Do not let mint dry out or get dusty, mulch to hold moisture, and scout the undersides in hot weather when mites move fastest.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Even watering

Keep mint evenly moist and mulched. Mites build up fastest on a plant that has been allowed to dry out, so steady water is the main defense on this crop.UC IPM puts water-stressed plants in the highly susceptible class and has mite numbers climbing through June into September. The bad mite years on mint are the ones where a pot or a bed edge went dry and hot more than once.
Water spray

Wash the undersides of the leaves with a strong spray of water. Done regularly, and in hot weather even daily, this alone often holds mites down, and it keeps the foliage from getting dusty.UC IPM's finding is that regular forceful spraying often reduces mite numbers adequately, with a water spray or mist to leaf undersides at least once a day in a hot spell. Confirm the mites before starting: a hand lens is needed to tell mites and their eggs and webbing from stippling something else left.
Buying and releasing natural enemies

Predatory mites can be bought and released onto an infestation. UC IPM names one for mint specifically, Neoseiulus fallacis, and a release makes more sense on a big patch than on a few plants.The published release figures are commercial, quoted per acre and triggered off a sampled leaf count, so the numbers do not scale to a garden bed; what transfers is that a mint-specific predatory mite exists and is sold. Conserve what is already present first, because UC IPM also reports that mite outbreaks frequently follow an insecticide application.
Insecticidal soap

Insecticidal soap will knock mites back, but only where the spray actually reaches them, so coat the leaf undersides and expect to repeat. Do not use it on a plant that is dry at the roots, and not when the temperature is above 90°F.Soap kills mites on contact and nothing else, so coverage decides the outcome and repeat applications are normal. The 90°F ceiling and the water-stress exclusion are UC IPM's, and they bite hard here, because mite weather and spray-injury weather are the same weather.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Cutworms

P · 03

Symptoms Young shoots and newly set plants are found cut through at or just below the soil line, with the severed top lying beside the stump.Utah State lists cutworms among mint's insect pests: the larvae feed at or below ground level and sever the stems of seedlings and young plants, so the damage reads as a clean cut at the base rather than as chewed foliage. The loss is per plant and it lands during establishment. Cause Cutworms are caterpillars that live in the soil and feed at or just below ground level, chewing straight through the stems of young plants.Soil-dwelling caterpillars feeding at or below the soil surface. No cited document gives a species for mint, and Utah State names none, so this stays at the group level. The feeding position is what decides the control: a stem cut underground is not reachable by anything applied to the foliage. Organic treatment Ring each newly set plant with a collar at the base: a rim cut from a plastic pot, or a can with both ends out, sunk about an inch into the ground. If a shoot goes down anyway, turn the top inch of soil beside the stump and remove the caterpillar you find there.Utah State's control for mint is a collar or a trap on individual plants, so the work is per plant and belongs to the planting-out window rather than to the season. Searching the soil at the point of fresh damage is the follow-up where a collar was missed. Utah State's other listed option is a registered insecticide; this record stops at the barrier, because the pest is a soil-level chewer on a crop that is cut and eaten fresh. Prevention Protect new plants at planting time rather than after the first one goes down, since the damage happens overnight and cannot be undone.The window is establishment. Collars go on as plants are set out and come off once each plant has several stems, because after that a running mint patch has more growing points than a soil-level chewer can reach.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Stem collars

Set a barrier around each new plant when you put it in: a rim cut from a plastic pot, or a can with both ends out, sunk about an inch into the ground so nothing can reach the stem from the soil.This is Utah State's own control for cutworms on mint, protecting the individual plant, and it earns its keep only through establishment, while one severed stem is the entire plant. The barriers come off once a plant has spread and has stems to spare.
Handpicking

A felled shoot marks the spot. Sift the top inch or two of soil beside it and you will usually turn up the caterpillar, which can be lifted out by hand.Utah State places the larvae at or below ground level, which tells you where to search: fresh damage is a located target, and turning soil there is far more productive than any general hunt across the bed.

No spray for this one. Prevention is the control.

Flea beetles

P · 04

Symptoms The leaves come up peppered with small holes. The beetles making them are tiny, black and glossy, and they are easy to miss because they leave the plant as you lean in.Utah State lists flea beetles among mint's insect pests and describes small, shiny black beetles chewing tiny holes in the leaves. Its control for them is a row cover in spring, which places the pressure on new growth early in the season rather than on a stand in full run. Cause Flea beetles are small leaf-chewing beetles that show up in spring and feed on the new leaves, leaving them full of little holes.Flea beetles as a group rather than one named species: Utah State's mint listing gives no binomial and no admitted document ties a particular flea beetle to garden mint. The pressure is a spring one, which is why the published control is exclusion at that time of year rather than a treatment applied to damage. Organic treatment Cover new plantings in spring with a floating row cover, a light fabric that lets in sun and rain but keeps the beetles off. That is the practical control; there is nothing to wash or pick off once the holes have been chewed.Utah State offers two controls for mint, a spring row cover or a registered insecticide. The cover is the one that belongs on a crop cut and eaten fresh, and it has to go on before the beetles arrive rather than after the first holes appear, because the feeding damage does not heal. Prevention Get the cover on early in spring, when the new growth is coming and the beetles are on the move.Exclusion is timed against the spring flush. Utah State's instruction is to cover plants in spring, which makes this a planting-season job rather than a response to damage, and there is no preventive step published for it later in the year.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Floating row cover

In spring, before the beetles turn up, spread a light row cover fabric over the mint and weight the edges down. Water and light reach the plants through it; the beetles do not. Take it off once the patch is growing hard.Utah State's stated control for flea beetles on mint is to cover plants in spring with row covers, so the timing is the whole of it: on before the beetles move, off when the stand is in full growth. Nothing applied afterwards repairs a chewed leaf, so the cover has to go on ahead of the damage and never in response to it.

No spray for this one. Prevention is the control.

Mint root borer

P · 05

Symptoms A patch that thins and weakens with nothing obviously wrong above ground. Lift a piece and the underground runners are tunneled and hollowed where a small caterpillar has fed inside them.The damage is below ground and shows as decline in a stand rather than as a mark on a leaf. UC IPM's account is that the larvae feed on leaves for two to four days, then drop to the soil surface and burrow into a rhizome, and the feeding that matters happens inside it. Its own sampling window is September through October, which is when lifting a runner and looking will actually find them. Cause The mint root borer is a moth caterpillar that feeds inside mint's underground runners. There is one generation a year, and the adults are flying in early summer.Fumibotys fumalis, the mint root borer. UC IPM puts adult emergence between early and mid-June with peak flight from mid to late July, one generation a year; the larvae leave the rhizomes in October and overwinter in the soil an inch or so below the surface, then pupate in spring. Every step that works against it is keyed to that calendar. Organic treatment There is no spray for a caterpillar sitting inside a runner. What works is turning the bed over in late fall or early spring, while the larvae are just under the soil surface, and starting a fresh planting on ground that has not grown mint.UC IPM's timing is explicit: tillage works in late fall or spring, when the borer is overwintering, or before adults emerge in June. Rotation to a non-host is the other published option. Parasitic nematodes are used against it as well, released through the irrigation, which at home is a watered-in soil drench; the published release rate is per acre and is not a garden figure. Prevention Check the runners when you divide the patch in fall, and reset a declining patch into ground that has not carried mint.UC IPM samples for larvae from September through October, which is also when a home patch is lifted and divided, so the check costs nothing extra. Its treatment threshold is a commercial one and is not the point at this scale; finding larvae at all is reason enough to use one of the two tillage windows UC IPM names, late fall or before adults emerge in June.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Off-season tillage

Turn the bed over in late fall, or in spring before June. That is when the caterpillars are sitting in the soil just under the surface instead of inside the runners, and digging through reaches them.UC IPM's window is exact: tillage is effective in late fall or spring while the borer is overwintering, or before adults emerge in June. The larvae leave the rhizomes in October and sit an inch or so down, so a fall dig follows them out of the runner and into reach, and a spring dig catches them before they pupate.
Crop rotation

Where a patch has been going downhill, move the mint to fresh ground and put something else in the old bed for a season or two.UC IPM lists rotation to a non-host as an option, which at garden scale means resetting divisions into ground with no mint history rather than replanting the same corner. With one generation a year and mint as the host, a bed given a season without mint gives the next generation nothing to go back into.
Beneficial nematodes

Beneficial nematodes, sold as a soil drench, are used against this pest. Water them into moist, warm soil where the larvae are, rather than spraying anything on the leaves.UC IPM releases parasitic nematodes through the irrigation system against mint root borer. The published rate is a per-acre commercial figure and does not translate, so follow the pack for dose; what carries over is the delivery, a watered-in drench onto soil holding larvae, and the timing, the fall stretch after the larvae have left the rhizomes.

No spray for this one. Prevention is the control.

Diseases

Mint rust

D · 01

Symptoms Small orange to rust-brown powdery spots on the undersides of the leaves and on the stems and leaf stalks. Badly affected leaves curl, turn yellow then brown, and fall. Pick the affected growth off and get rid of it as soon as you see it.Mint rust is Puccinia menthae, named by both RHS and WSU; NC State lists rust as one of spearmint's two main diseases without naming the fungus. Golden to cinnamon-brown pustules build on the stems and leaf undersides through the season, and a heavy infection defoliates the patch and reduces the essential oil in what is left. The stage worth learning is the early spring one: systemic infections throw up twisted, distorted shoots whose stems break easily, carrying pale blister-like pustules on the stems and leaf stalks, and those few plants are what seeds the rest of the year. Cause A rust fungus that spreads on airborne spores and needs the leaves to stay wet. It lives through the winter on last year's stubble and fallen leaves, and it can also ride in on the cuttings or runners you plant with, so a patch left standing reinfects itself each spring.Puccinia menthae. Wet, cloudy weather and long spells of leaf wetness from rain, dew or sprinklers drive it, and under those conditions WSU has it recycling every 8 to 10 days. It carries over as dark overwintering pustules on stubble and fallen foliage, and on the runners and cuttings used for propagation, with resting spores in the soil as well; escaped mint growing nearby is a second reservoir the bed itself does not control. Organic treatment Pull off and bin the rusted growth as soon as it shows, before the dark overwintering spots form on it. Thin a crowded patch so air moves through, water at the soil rather than over the top, and clear the stubble and fallen leaves off the bed in fall. Where it comes back every year, start again from cuttings taken off clean, rust-free plants.Rogue the twisted, distorted shoots out in early spring, before they throw spores across the rest of the patch, and keep taking infected leaves off through the season ahead of the dark resting stage. Open the stand up by dividing, move the water to the soil line or at least to the morning, and take the stubble and fallen foliage off the bed in fall, which is where the fungus is sitting when the season ends. Renew from inspected, rust-free cuttings: WSU's instruction is to monitor cuttings closely and discard infected ones rather than plant through the problem. Prevention Space plants for good airflow, avoid wetting the foliage, keep the patch from getting congested, and start new plantings from clean stock.Airflow, dry foliage, and uncongested spacing are the defenses; propagate only from rust-free plants and reset a chronically infected patch elsewhere.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Garden sanitation

Take the rusted leaves off as you see them, and in fall clear the old stems and fallen foliage right off the bed. That debris is where the fungus spends the winter, and leaving it is what starts next spring.WSU puts the overwintering stage on mint stubble and foliage, where the pustules go dark chocolate brown in late summer and fall and become the following spring's inoculum. RHS supplies the in-season deadline: take affected growth out before the black resting spores form and reach the soil.
Airflow and spacing

Thin or divide a crowded patch so air moves through it and the leaves dry off faster after rain or dew.WSU has the disease recycling every 8 to 10 days whenever moisture sits on the foliage, so the lever is the number of hours a day the canopy stays wet. Utah State treats thinning and dividing as maintenance a spreading mint patch needs anyway, which makes this the cheapest thing you can do about rust: it costs an afternoon you were going to spend on the patch regardless.
Water at the base

Water in the morning, and get it down at the roots rather than over the top. What feeds rust is foliage that stays damp all night, so the aim is to have the leaves dry by evening.Utah State's rust row gives both halves: use drip irrigation, or apply overhead water before mid-day, and avoid wet leaves overnight. Dew and rain still wet the canopy, so watering this way shortens the wet hours rather than removing them, which is enough to cut the number of cycles in a season.
Clearing the weeds that host it

Mint escapes. If there are patches of wild or run-away mint near the bed, cut them back, because rust comes across from them in spring.WSU names escaped and non-cultivated mint as a spring source of infection, which matters more on this crop than on most: the plant runs out of a bed and keeps going, and an untended stand along a fence or a ditch is a reservoir that no amount of tidying inside the bed will reach.
Clean planting stock

Start new plants from cuttings taken off clean, healthy mint. Rust travels on the cuttings and runners you plant with, so a new bed can begin infected.WSU traces outbreaks to systemic infections and pustules on the rhizomes and stem cuttings used in propagation, and its instruction is to inspect source material, monitor cuttings closely and discard infected ones promptly. Propagation is the one point in the cycle where the disease can be kept out of a new bed entirely.

No spray for this one. Prevention is the control.

Verticillium wilt

D · 02

Symptoms Leaves yellow from the edges inward, curl up and die, starting low on the plant, and whole shoots wilt and die back. There is no spray that cures it; an affected plant is pulled out.Utah State lists verticillium wilt for mint and describes leaf yellowing that starts at the margin, with the leaves curling and dying; UC IPM's peppermint guidelines carry it through to wilting and plant death. The fungus is Verticillium dahliae, and the reason this is a siting problem rather than a spraying one is that it survives between crops and through winter as microsclerotia, pinhead-sized hardened bodies in the soil. Neither document offers any chemical control. Cause A soil-borne fungus that gets into the plant's water-carrying tissue and blocks it. There is no cure for a plant once it is infected, and the fungus stays in the ground for years after the plant is gone. UC IPM puts a number on the cost: a stand that might have run five years or longer can be cut back to as little as two to four.Verticillium dahliae, a soilborne fungus that invades the vascular system. It survives between crops as microsclerotia, and UC IPM's figure for infested ground is a minimum of five years in crops that do not build it up, with mint, potatoes and strawberry named as the ones not to rotate to. Organic treatment There is no cure for an infected plant, so pull it out. Start the new planting from clean cuttings in a bed with no history of the disease. Go easy on the fertilizer as well: Utah State names over-feeding as something to avoid here. And once wilt has been in a bed, do not follow the mint with potatoes or strawberries, which build the same fungus up.Rogue out affected plants and manage by prevention: propagate disease-free cuttings, establish new patches in clean ground away from prior verticillium hosts, and rotate the mint bed on a multi-year cycle where the disease appears. Prevention Plant clean stock in ground with no history of the disease. Where wilt has already shown up, that ground needs a long break: UC IPM's figure is at least five years in crops that do not feed the fungus, and it says not to follow with mint, potatoes or strawberry. Corn, onions, garlic and cereals are on its acceptable list.Use clean stock: UC IPM's standard for commercial plantings is rootstock certified free of Verticillium dahliae, and the home equivalent is taking divisions from a patch that has never wilted. Avoid working through or cultivating an infected patch, since that spreads the microsclerotia, and clean the soil off tools and boots on the way out. Note which way the rotation warning runs: UC IPM is telling you what not to plant after mint in infested ground, and it adds that strains specialized on other crops such as potatoes usually do not attack mint, so old potato ground is not the hazard for mint that a general verticillium warning would imply.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Garden sanitation

Dig out a wilting plant, roots and all, and get it off the bed. Knock the soil off your tools and boots before you walk to another bed.UC IPM's field sanitation is cleaning equipment, vehicles and shoes, and the shoe clause scales straight down to a garden: the fungus travels as microsclerotia in soil, so soil on a spade is the vector. Minimizing cultivation in an affected bed matters for the same reason, since digging through spreads them.
Balanced nitrogen feeding

Do not push the patch with fertilizer. Utah State lists over-feeding as one of the things to avoid where verticillium wilt has shown up.This is Utah State's third named control for the disease on mint, alongside rotation and removal, and it is the only one that costs nothing and changes nothing about the bed. Feed for steady growth rather than for a flush.
Crop rotation

Once wilt has been in a bed, keep mint out of it for at least five years, and keep potatoes and strawberries out too. Corn, onions, garlic and cereals are fine to grow there in the meantime.UC IPM's minimum is five years in crops that do not build the fungus up, and it names both sides: do not rotate to mint, potatoes or strawberry; acceptable are grass hays, corn, sudangrass, alfalfa, cereals, onions and garlic. At garden scale that constraint is the real cost, because five years is longer than most beds go without a susceptible crop.
Clean planting stock

Start a new patch from cuttings or divisions off plants that have never wilted, not from a piece of the bed that is going down.The commercial standard is rootstock certified free of Verticillium dahliae. No certification scheme exists for a garden division, so the working equivalent is provenance: propagate from a stand with no wilt history, and never carry divisions out of an affected bed into clean ground.

No spray for this one. Prevention is the control.

Powdery mildew

D · 03

Symptoms A white to gray powdery coating on the leaves, stems and leaf stalks. It starts as small round patches, up to about half an inch across, that spread and run together until they cover the plant. In a bad case the leaves yellow and fall.White to gray mycelium and spores on leaves, stems and petioles, appearing as discrete round colonies up to half an inch across that gray with age, run together and can spread over the whole plant; severe infections yellow the leaves and drop them. Susceptibility is not uniform across the mints: WSU has Scotch spearmint severely damaged, with peppermint and native spearmint usually not seriously affected. Cause A powdery mildew fungus. Unlike most leaf diseases it does not need wet leaves to get going; what it wants is crowding, shade and soft growth.A powdery mildew of the mint family, and not a settled single species: WSU notes the name commonly applied to it has been split into more than twenty, with several powdery mildews attacking Lamiaceae in the Pacific Northwest, so this record does not hard-name the fungus. The drivers it does publish are young, succulent growth from heavy nitrogen and irrigation, and humid, shady conditions, which is why greenhouse mint gets it worst. It overwinters on infected mint plants, on stubble, and on wild hosts of the mint family. Organic treatment Cut out the worst-covered stems and thin the patch so light and air get in. Do not try to fix this one by keeping the leaves dry, because it is not a wet-leaf disease. If it turns up every year, sulfur applied early, before the coating appears, is the treatment that works; once it is established it is hard to shift.Timing decides this one: WSU's point is that once powdery mildew is established it is very hard to control, and its sulfur program starts when plants are 4 to 6 inches tall rather than at first symptom. Sulfur carries two limits, and on a culinary herb the harvest one bites hardest: not within 30 days of cutting, because sulfide from it taints the oil that carries mint's flavor, and not at all if temperatures will exceed 90°F within three days. Leaf wetness is not the lever here and treating it as one wastes the effort: mint under overhead sprinklers is generally not a powdery mildew problem, and it is when that irrigation stops for a few days that the disease runs, on the humidity trapped in the canopy. Prevention Give the patch room and light, and go easy on the nitrogen. Crowding, shade and soft, over-fed growth are what this disease needs; whether the leaves are wet or dry makes far less difference.Site and feeding do the work here. WSU has the disease most severe on young succulent plants produced by heavy nitrogen and irrigation, and severe on greenhouse mint because of humid, shady conditions, so an open, sunlit stand fed modestly is the prevention. Clearing infected plants and stubble in fall matters too, since that, together with wild mint-family hosts, is where it is thought to overwinter.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Airflow and spacing

Thin the patch and give it light. Powdery mildew builds where growth is packed and shaded, and mint fills in until the middle of a stand is both.Crowding and shade are the levers on this disease, and leaf wetness is not one of them. WSU has it severe on greenhouse mint because of humid, shady conditions, so opening the stand and siting it in sun takes away both drivers at once. Mint is one of the few crops this dataset is happy to put in part shade, which is exactly why the siting decision carries weight here.
Balanced nitrogen feeding

Feed lightly. The soft, fast growth that a heavy dose of nitrogen produces is what this fungus takes hold on first.WSU's driver is explicit: the disease is most severe on young, succulent plants such as those resulting from heavy nitrogen fertilization and irrigation. On a herb you cut repeatedly there is a standing temptation to push regrowth with fertilizer, and that flush is what the mildew colonizes.
Garden sanitation

Pull out badly coated plants, and clear the old growth off the bed at the end of the season along with any wild mint growing beside it.WSU's overwintering account is infected mint plants, stubble and wild hosts of the mint family, so clearing up in fall is preventive for next year rather than curative for this one. Rust and anthracnose on the same crop want the identical fall clear-out, which is the argument for doing it once and doing it thoroughly.
Sulfur

Sulfur works on powdery mildew, but only if you get in before the coating appears, and on a herb there is a catch: WSU says not to apply it within 30 days of harvest. If you are cutting mint every week or two, that makes sulfur an early-season option and not something to reach for once you are picking. Do not spray it either if the temperature is heading above 90°F in the next three days.WSU starts sulfur when plants are 4 to 6 inches tall, a calendar trigger rather than a symptom one, and warns that once the disease is established it is very hard to control. Two limits govern it. No application within 30 days of harvest, because sulfide from sulfur taints the essential oil that carries mint's flavor, and none if temperatures will exceed 90°F within three days. Together those put the only usable window early, well before a patch is in regular cutting, which on most home plantings means this material stays in the shed.

The bottom rungs are products with label rules: timing, pollinators, and days to wait before harvest. Before you spray →

Anthracnose

D · 04

Symptoms Small water-soaked spots on the leaves and on the stems. A badly hit patch looks spotted and ragged rather than dusted or coated.Utah State's description for mint is small water-soaked spots on the leaves and stems. NC State's spearmint page lists leaf spot as one of the crop's two main diseases without naming an organism, so this record describes anthracnose on mint from Utah State alone; no admitted document gives it a binomial. Cause A leaf-spotting fungus that gets going in a crowded, damp patch and keeps spreading while the foliage stays wet. No spray is offered for it on mint: Utah State's fix is to take the diseased plants out, cut the patch to the ground in fall, and move the planting to fresh ground.A leaf and stem spotting fungus. No admitted document names the organism on mint, so this record does not name it either. Utah State's general disease line for the crop is the mechanism it publishes: appropriate watering and enough sunlight prevent most of it, drip irrigation is named as the way to keep the foliage dry, and thinning or dividing a thickening patch is part of keeping mint healthy. Organic treatment Take out the spotted plants. Water at the soil so the leaves stay dry, thin the patch to let sun and air in, and cut the whole planting to the ground in fall and clear the debris away.Utah State's control is three parts: rotate the planting area, remove diseased plants, and prune healthy plants to the ground in fall. The fall cut is the one that does the work, and it is a fall sanitation step rather than the mid-season shear the old record described. No spray is offered for this disease on mint by any source read for it. Prevention Give the patch sun and space, water at the soil line, and start a new bed in fresh ground if the spotting comes back year after year.Utah State's preamble is the prevention: most of mint's diseases can be minimized by appropriate watering and enough sunlight, with drip irrigation named as the way to keep the foliage dry and thinning or dividing treated as maintenance a spreading patch needs anyway. Rotating the planting area is the fourth part, and it is the one that takes planning rather than an afternoon.

The control ladder

The ladder troubleshoots from the gentlest solution to the strongest. Start with the gentlest option and only move on when and if it doesn't work.

Garden sanitation

Pull the diseased plants out, and in fall cut the healthy growth right down to the ground and rake the debris off the bed.Two of Utah State's three named controls for anthracnose on mint are here: remove diseased plants, and prune healthy plants to the ground in fall. Note where it places the cut, in fall and after the season, not as a mid-season shear to force clean regrowth; on a perennial that regrows from the crown the fall version costs nothing.
Airflow and spacing

Thin or divide the patch so it is not a solid mat. Sun into the middle of the stand and air moving through it is what Utah State's general advice for mint comes down to.Utah State frames thinning and dividing as maintenance mint needs anyway and pairs proper sunlight with appropriate watering as the way most of the crop's diseases are minimized or eliminated. A mint bed left to itself becomes exactly the dense, shaded, slow-drying interior this fungus wants.
Water at the base

Put the water on the soil, not on the leaves. Drip or a soaker hose is the easiest way to manage that on a bed of mint.Utah State calls out drip irrigation by name as the way to provide regular water and keep foliage dry. Unlike powdery mildew on the same plant, this is a disease where the dry-foliage instruction is the correct one, which is precisely why the two are separate records now.
Crop rotation

Where the spotting comes back year after year, move the mint to fresh ground rather than replanting the same bed.Rotating the planting area is the first of Utah State's three anthracnose controls. On a perennial it is a division-and-reset decision rather than an annual one, and it pairs naturally with the fall cut-down, which is when the patch is easiest to lift.

No spray for this one. Prevention is the control.

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