Slow to germinate (3–4 weeks) but then productive for months. Soaking seeds overnight speeds germination. Biennial — grows leaves first year, flowers second.
Plant window opens
May 01
Last chance to plant
May 20
Last frost
~May 1
Days to harvest
70–90 days
Difficulty
Medium
Start indoors now — Zone 4
Harvest: Jun – Oct
Planting Calendar
In Zone 4, Parsley can be planted outdoors from May 01 — the window closes around May 20. Start seeds indoors around Mar 1 – Mar 15.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
plant
too early
too early
indoors
indoors
plant
too late
too late
too late
too late
too late
too late
too late
harvest
harvest
harvest
harvest
harvest
harvest
too early
indoors
plant window
harvest
too late
Cold-hardy once established — can overwinter under mulch and resume in spring.
Get notified when to plant, water, and harvest your Parsley — personalized for your zone.
What Zone 4 growers say about Parsley
plant team · Zone 4
Notes from real growers will appear here as our community grows. Be the first to share what works in your garden.
Share your own tip for Zone 4 →
Care Guide
Sunlight
Full sun to partial shade · 4–8 hrs/day
Watering
Regular
Spacing
8–10 inches
Soil
Rich, well-draining, moist
Days to maturity
70–90 days
Soil pH
5.5–6.7
Plant tip · Zone 4
Cold-hardy once established — can overwinter under mulch and resume in spring.
How to know it's ready
Snip outer stems at any time once plant has 6+ stems.
Watering Parsley
How often
Every 3–4 days
How much
1 inch per week
Method
At soil level
Overwatering signs
Yellow lower leaves
Underwatering signs
Wilting, poor growth
Feeding Schedule
How often
monthly
Feed type
Balanced fertilizer
Key timing
throughout growing season
NPK: 10-10-10
Biennial — feeds moderately. Monthly balanced feed. Avoid high nitrogen which reduces flavour intensity.
Example product: Espoma Herb-Tone
Reminder: every 28 days after feeding
Succession Planting
Sow every 4 weeks
Sow a second batch 4 weeks after the first. Parsley is slow to germinate (3–4 weeks) and biennial — in its second year it bolts immediately. For practical purposes treat it as an annual and sow a fresh batch mid-season. The second sowing will be producing vigorously through autumn and into early winter in mild zones. Soak seeds overnight before sowing to improve germination speed.
Indoors — 10 weeks before last frostHarden off required
Start 10–12 weeks before last frost — slow germination (3–4 weeks). Soak seeds overnight. Transplants fine. Harden off over 5 days.
Container friendly · Minimum 1 gallons
Excellent container herb. 8 inches deep minimum (taproot). Window boxes work well.
Companion Planting for Parsley
What you plant near parsley makes a real difference — here's what to plant, when, and why.
Pest deterrent
Tomatoes
Attracts predatory wasps that eat caterpillars
Plant at same time
Roses
Repels rose beetles
Plant at same time
Keep away from
Alliums— Inhibit parsley growth
Pests & Diseases
Know what to look for before it gets out of hand — early identification is the most important step.
Aphids
pestmedium
What to look for
Clusters of tiny soft insects on new growth and leaf undersides. Leaves curl, yellow, or become sticky with honeydew. Sooty black mold may follow.
Cause
Multiple aphid species. Populations explode rapidly in warm weather.
Organic treatment
Blast off with strong water jet. Apply insecticidal soap or neem oil directly to colonies. Introduce ladybugs or lacewings.
Prevention
Plant marigolds and nasturtiums nearby. Avoid excess nitrogen fertilizer which creates soft, aphid-attractive growth. Encourage beneficial insects.
Carrot fly
pestlow
What to look for
Root damage and wilting. Cilantro and dill are in carrot family and attract same pests.
Cause
Psila rosae. Affects all members of the carrot family.
Organic treatment
Grow under fine insect mesh.
Prevention
Insect mesh. Grow away from carrots and parsnips.
Leaf spot
diseaselow
What to look for
Dark brown spots on leaves. Affected leaves yellow and die.
Cause
Bacterial or fungal leaf spot. Favoured by wet conditions.
Organic treatment
Remove affected leaves. Copper-based fungicide.
Prevention
Water at soil level. Good spacing.
Recommended Varieties
Italian Giant (flat-leaf, superior flavour)
Forest Green (curly, decorative)
Hamburg (root parsley — both root and leaf edible)
Flat-leaf (Italian) parsley has significantly more flavour than curly types — use curly for garnish only.
Parsley is in the carrot family — rotate away from other Apiaceae crops.
Storing Your Harvest
Room temp
3–5 days in water
Fridge
2 weeks in water in the fridge covered with a bag
Freezer
Blanch briefly, squeeze dry, freeze — or blend into oil cubes
Flat-leaf parsley stores better than curly. The water-glass fridge method is highly effective.
Free app · Kickstarter October 2027 · iOS February 2028
Know exactly when to plant, prune, and harvest Parsley
plant uses your ZIP code and real frost data to tell you the right day — not just the right month. Get notified when your planting window opens, when to succession sow, and when to cut back for next season.
You're in ✓ — we'll be in touch before launch.
Something went wrong — try again.
Be first to back on Kickstarter · founding grower pricing locked in.
Common questions
In Zone 4, start parsley seeds indoors around Mar 1 – Mar 15, then transplant outdoors May 1 – May 20 after your last frost around May 1. Cold-hardy once established — can overwinter under mulch and resume in spring.
Zone 4 has an average last spring frost around May 1 and a first fall frost around Oct 1. These vary by location — the plant app uses your ZIP code with NOAA data for precision.
Good companions for parsley include Tomatoes, Roses. Avoid planting near Alliums.
Parsley typically takes 70–90 days to harvest in Zone 4. Expected harvest window: Jun – Oct.
These guides get better when growers share what they know. If something's off or you've learned something worth passing on, add it here — accepted tips earn you a Founding Grower badge when plant launches.
Your tip for growing Parsley in Zone 4
Your name (optional)
Your zone (optional)
Tips are reviewed before publishing. You'll hear from us before the app launches.
Thanks for contributing! We'll review your tip and be in touch before launch.
What needs correcting?
What should it say?
Your zone (optional)
Thanks — we'll review this and update the guide if needed.