Zone 9 · Herbs Growing Guide

When to Plant Lemongrass
in Zone 9

A tropical grass that doubles as a dramatic ornamental clump. Harvest stalks for curries, soups, and teas. In warm zones it's a large perennial — in cold zones, grow in a pot and bring indoors in winter.

Plant window opens
Feb 01
Last chance to plant
Apr 01
Last frost
~Jan 31
Days to harvest
90–120 days
Difficulty
Easy
Plant now — Zone 9
Harvest: Apr – Dec

Planting Calendar

In Zone 9, Lemongrass can be planted outdoors from Feb 01 — the window closes around Apr 01.

Perennial in Zone 9. Can direct plant divisions. Large productive clumps year-round.

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What Zone 9 growers say about Lemongrass
plant team · Zone 9
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Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Moderate
Spacing
24–36 inches
Soil
Well-draining, fertile, moisture-retentive
Days to maturity
90–120 days
Soil pH
5.5–7.0
Plant tip · Zone 9
Perennial in Zone 9. Can direct plant divisions. Large productive clumps year-round.
Lifecycle
Perennial
How to know it's ready
Harvest outer stalks at ground level when 12+ inches tall. Inner white stalk is used for cooking.

Watering Lemongrass

How often
Every 3–4 days
How much
1–2 inches per week
Method
At soil level
Overwatering signs
Yellowing, root rot
Underwatering signs
Brown leaf tips, slow growth

Feeding Schedule

How often
monthly
Feed type
Nitrogen-rich fertilizer
Key timing
throughout growing season
NPK: high N for leafy growth, e.g. 10-5-5

Tropical grass that loves nitrogen. Feed monthly during the growing season. Reduce feeding in autumn.

Example product: Fish emulsion
Reminder: every 28 days after feeding

Seasonal Care

Feb
Cut Back
Cut back to 6 inches in early spring. In zones below 9, dig up and overwinter indoors in a pot before first frost.
Division
Divide existing clumps or buy as plants. Can start from seed but very slow.
Container friendly · Minimum 5 gallons
Excellent container plant — grow in pots and bring indoors before frost in zones below 9. 5-gallon minimum for good yield.

Companion Planting for Lemongrass

What you plant near lemongrass makes a real difference — here's what to plant, when, and why.

Pest deterrent
Basil
Combined aromatics deter flying insects
Plant at same time
Marigolds
Combined pest deterrent
Plant at same time
Keep away from
Fennel — Inhibits most plants

Pests & Diseases

Know what to look for before it gets out of hand — early identification is the most important step.

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.
What to look for
Metallic striped beetles eating leaves and flowers. Most active autumn and spring.
Cause
Chrysolina americana. Affects lavender, rosemary, sage, thyme, marjoram.
Organic treatment
Hand-pick adults and larvae. Shake over a sheet. Pyrethrum spray.
Prevention
Check plants regularly. Avoid hiding spots at base.
What to look for
White coating on leaves. Leaves yellow and drop. Common on sage and mint.
Cause
Various Erysiphe fungi.
Organic treatment
Remove affected leaves. Improve airflow. Neem oil spray.
Prevention
Water at soil level. Ensure good spacing.

Recommended Varieties

  • East Indian Lemongrass (Cymbopogon flexuosus — most flavourful)
  • West Indian Lemongrass (Cymbopogon citratus — most widely grown)
Both species work for cooking. West Indian is more widely available; East Indian has slightly more intense citral oil content.
Crop Rotation — rotate every 0 years
Perennial — no annual rotation
Avoid planting after: N/A — permanent planting
Good to follow: N/A — permanent planting
Fruit trees and perennial shrubs are permanent plantings — crop rotation does not apply. Choose the planting site carefully as it is permanent.

Storing Your Harvest

Room temp
1–2 weeks in a glass of water
Fridge
2–3 weeks wrapped
Freezer
Freeze whole stalks — peel outer layers before using frozen
Lemongrass freezes very well. Freeze extra stalks whole — slice directly from frozen.

Free app · Kickstarter October 2027 · iOS February 2028

Know exactly when to plant, prune, and harvest Lemongrass

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.

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Common questions

In Zone 9, direct sow lemongrass outdoors Feb 1 – Apr 1 after your last frost of approximately Jan 31. Perennial in Zone 9. Can direct plant divisions. Large productive clumps year-round.
Zone 9 has an average last spring frost around Jan 31 and a first fall frost around Dec 15. These vary by location — the plant app uses your ZIP code with NOAA data for precision.
Good companions for lemongrass include Basil, Marigolds. Avoid planting near Fennel.
Lemongrass typically takes 90–120 days to harvest in Zone 9. Expected harvest window: Apr – Dec.

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.

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