Maine’s coastal areas offer slightly longer growing seasons than inland locations for lemongrass establishment. If you’re wondering about the Best Time To Plant Lemon Grass In Maine, the answer depends on your local frost dates and microclimate. This tropical herb needs warm soil and consistent temperatures to thrive in New England’s short summers.
Understanding Maine’s Growing Zones For Lemongrass
Maine spans USDA hardiness zones 3b through 6a, with most of the state in zones 4 and 5. Lemongrass is a tropical perennial that cannot survive Maine winters outdoors. It must be treated as an annual or overwintered indoors.
The key factor is soil temperature. Lemongrass roots need at least 60°F (15°C) to grow actively. Air temperatures below 50°F will stunt or kill young plants.
Coastal Vs Inland Planting Windows
Along the coast, from Kittery to Bar Harbor, the last spring frost typically occurs between May 15 and May 25. Inland areas like Bangor, Augusta, and Presque Isle may see frost until early June.
- Coastal zones: Plant lemongrass after May 20
- Inland zones: Wait until June 1–10
- Northern Maine: Delay until mid-June
Check your specific frost dates using the Old Farmer’s Almanac or your county extension office. These dates vary year to year.
Best Time To Plant Lemon Grass In Maine
The absolute Best Time To Plant Lemon Grass In Maine is late May through early June, after all danger of frost has passed and soil has warmed. This window gives plants 90–120 days of warm weather before the first fall frost.
For most Maine gardeners, the ideal planting date falls between May 25 and June 10. If you’re in a colder microclimate, aim for June 1–15.
Why Timing Matters So Much
Lemongrass is a heat-loving plant. It grows slowly in cool soil. If you plant too early, the plant may sit dormant and rot. If you plant too late, it won’t have enough time to mature before frost.
Maine’s average first fall frost occurs between September 15 and October 1, depending on location. That means you have roughly 100–120 growing days.
Minimum Growing Requirements
- Soil temperature: 65–75°F ideal
- Air temperature: Consistently above 55°F at night
- Day length: At least 12 hours of sunlight
- Frost-free period: Minimum 90 days
Starting Lemongrass Indoors For Maine Gardens
Because Maine’s growing season is short, starting lemongrass indoors gives you a head start. Begin seeds or divisions 8–10 weeks before your last frost date.
For coastal Maine, start indoors around March 15–April 1. For inland areas, start around March 20–April 10.
How To Start Lemongrass Indoors
- Purchase fresh lemongrass stalks from a grocery store or garden center
- Place stalks in a glass of water with the root end submerged
- Change water every 2–3 days
- After 2–3 weeks, roots and new shoots will appear
- Plant rooted stalks in 4-inch pots with potting soil
- Keep in a warm, sunny window or under grow lights
- Water regularly but don’t oversaturate
You can also start from seed, but germination takes 14–21 days. Seeds need consistent warmth (70–80°F) to sprout.
Hardening Off Before Outdoor Planting
About 7–10 days before transplanting, start hardening off your lemongrass. Place plants outside for 1–2 hours in a sheltered spot, gradually increasing time each day.
Bring plants indoors if temperatures drop below 50°F. This process reduces transplant shock.
Preparing Your Maine Garden For Lemongrass
Lemongrass needs full sun and well-draining soil. In Maine’s often heavy clay soils, raised beds or containers work best.
Soil Preparation Steps
- Choose a south-facing spot with 6–8 hours of direct sun
- Amend soil with compost or aged manure
- Ensure pH between 6.0 and 7.5
- Add sand or perlite to improve drainage if needed
- Warm soil by covering with black plastic for 2 weeks before planting
Raised beds warm up faster than ground soil, which helps in Maine’s cool springs.
Container Growing Options
Containers are ideal for Maine gardeners. You can move pots indoors when frost threatens. Use 5-gallon pots with drainage holes.
Fill with quality potting mix. Place containers against a south-facing wall for extra warmth.
Planting Lemongrass Outdoors In Maine
Wait until nighttime temperatures stay above 55°F. For most of Maine, this happens after June 1.
Step-By-Step Outdoor Planting
- Dig holes 12–18 inches apart
- Make holes deep enough to cover the root ball
- Place plants at the same depth they were in pots
- Backfill with soil and press gently
- Water thoroughly after planting
- Apply 2–3 inches of organic mulch
Mulch helps retain moisture and keeps soil warm. Use straw, shredded leaves, or grass clippings.
Spacing Considerations
Lemongrass grows into large clumps, up to 4 feet tall and 3 feet wide. Give each plant enough room. Overcrowding reduces airflow and increases disease risk.
If planting in rows, space rows 24–36 inches apart.
Caring For Lemongrass Through Maine’s Summer
Once planted, lemongrass needs consistent care to produce well. Maine’s summers can be humid, which lemongrass likes, but also variable.
Watering Requirements
- Water deeply 2–3 times per week
- Keep soil moist but not waterlogged
- Reduce watering during rainy periods
- Use drip irrigation to avoid wetting foliage
Lemongrass is somewhat drought-tolerant once established, but consistent moisture yields better growth.
Fertilizing Schedule
Feed lemongrass every 4–6 weeks during the growing season. Use a balanced fertilizer like 10-10-10 or fish emulsion.
Apply fertilizer after planting, then again in mid-July and late August. Stop fertilizing by September 1 to allow plants to slow growth before frost.
Pest And Disease Management
Lemongrass is relatively pest-resistant in Maine. Common issues include:
- Spider mites in hot, dry conditions
- Fungal leaf spots in humid weather
- Slugs and snails in damp areas
Use insecticidal soap for mites. Improve air circulation to prevent fungus. Hand-pick slugs at night.
Extending The Growing Season For Lemongrass
Maine gardeners can use season-extending techniques to get more from their lemongrass.
Using Row Covers And Cloches
Floating row covers add 5–10°F of warmth. Place them over plants in early spring or late fall. Remove during hot days to prevent overheating.
Cloches made from plastic bottles work for individual plants. Cut the bottom off and place over young plants.
Cold Frames And Greenhouses
A cold frame extends the season by 4–6 weeks. Plant lemongrass in the cold frame in early May for coastal areas, mid-May for inland.
Greenhouses provide the best environment. You can plant 2–3 weeks earlier and harvest 4–6 weeks later than outdoor plants.
Harvesting Lemongrass In Maine
Lemongrass is ready to harvest when stalks are at least 12 inches tall and about 1/2 inch thick at the base. This usually takes 75–100 days from transplanting.
When To Harvest
- Begin harvesting in late August for early plantings
- Peak harvest is September through early October
- Harvest before the first hard frost
Cut stalks at ground level using sharp pruners. Remove outer leaves. Use fresh or store for later.
How To Store Lemongrass
- Refrigerate fresh stalks in a plastic bag for up to 3 weeks
- Freeze chopped lemongrass in airtight containers for up to 6 months
- Dry lemongrass in a dehydrator or oven at low heat
Frozen lemongrass retains most of its flavor. Dried lemongrass is less potent but works in teas and soups.
Overwintering Lemongrass Indoors In Maine
You can keep lemongrass alive through Maine’s cold winters by bringing it indoors. This saves you from buying new plants each year.
Steps To Overwinter Lemongrass
- Dig up plants before the first frost (late September–early October)
- Trim stalks to 6–8 inches tall
- Pot in containers with fresh potting soil
- Place in a sunny south-facing window
- Water sparingly—once every 1–2 weeks
- Keep temperatures above 50°F
Indoor lemongrass grows slowly during winter. It may go semi-dormant. Resume regular watering in March.
Alternative: Take Cuttings
Instead of overwintering entire plants, take stem cuttings in late summer. Root them in water, then pot them up. This takes less space.
Common Mistakes When Planting Lemongrass In Maine
Even experienced gardeners make errors. Avoid these common pitfalls.
Planting Too Early
This is the most frequent mistake. Cold soil and air stunt growth or kill plants. Wait until soil is warm.
Overwatering In Cool Weather
In Maine’s early summer, rain is common. Overwatering leads to root rot. Let soil dry slightly between waterings.
Underestimating Space Needs
Lemongrass spreads quickly. Cramped plants produce thin stalks. Give them room to grow.
Ignoring Frost Warnings
A single frost can kill lemongrass. Watch weather forecasts in September. Cover plants or bring pots indoors when frost threatens.
Best Lemongrass Varieties For Maine
Some varieties perform better in Maine’s climate. Choose types that mature quickly.
- East Indian lemongrass (Cymbopogon flexuosus): Most common, matures in 90 days
- West Indian lemongrass (Cymbopogon citratus): Slightly slower, better for coastal areas
- Citronella lemongrass: Ornamental, less flavorful but hardy
Purchase from reputable nurseries that stock plants suited to northern climates.
Frequently Asked Questions
Can I Plant Lemongrass In Maine In July?
July is late but possible if you start with large transplants. You’ll have about 60–80 days before frost. Expect smaller harvests.
Should I grow lemongrass from seed or plants in Maine?
Plants or rooted stalks are easier and faster. Seeds require more time and warmth. For Maine’s short season, start with plants.
How Do I Protect Lemongrass From Maine Frost?
Cover plants with frost cloth or bring containers indoors. Harvest before hard frost. Mulch heavily around base for light frosts.
Can Lemongrass Survive Maine Winter In The Ground?
No. Lemongrass is not winter-hardy in Maine. It must be overwintered indoors or treated as an annual.
What Companion Plants Work With Lemongrass In Maine?
Lemongrass pairs well with basil, mint, and marigolds. Avoid planting near fennel or dill, which may cross-pollinate.
Final Tips For Success
Plant lemongrass after Memorial Day for most of Maine. Use raised beds or containers for better soil warmth. Water consistently and fertilize monthly.
Harvest before the first fall frost. Overwinter a few plants indoors for next year. With proper timing, you can enjoy fresh lemongrass from your Maine garden from late summer through early fall.
Remember that each growing season is different. Pay attention to your local weather patterns. A warm spring allows earlier planting. A cool, wet spring means waiting longer.
Lemongrass is rewarding to grow in Maine despite the climate challenges. The fresh flavor is worth the effort. Start small, learn from each season, and adjust your timing accordingly.
With careful planning and the right planting window, you can successfully grow lemongrass in Maine’s unique growing conditions.