New Hampshire’s cold winters mean gardeners typically wait until late May or early June to plant lemongrass outdoors. Knowing the best time to plant lemon grass in new hampshire is crucial for a successful harvest before the first frost arrives in autumn.
Lemongrass is a tropical plant that thrives in warmth. It cannot survive New Hampshire’s freezing temperatures. Planting it at the right time ensures it has enough growing days to mature.
Best Time To Plant Lemon Grass In New Hampshire
The optimal window for planting lemongrass in New Hampshire is from late May to mid-June. This timing aligns with the end of frost risk and the start of consistently warm soil.
Soil temperature should be at least 65°F (18°C) before transplanting. Cold soil stunts growth and can rot the stalks. Use a soil thermometer to check your garden bed.
Why Late Spring Is Ideal
New Hampshire’s last frost date varies by region. In southern areas, it is around May 15. In northern zones, it can be as late as June 1. Planting after these dates protects young plants.
- Southern NH: Plant after May 20
- Central NH: Plant after May 25
- Northern NH: Plant after June 5
Lemongrass needs 100 to 140 frost-free days to reach full size. A late May planting gives it enough time before the first fall frost, which typically occurs in late September or early October.
Starting Indoors For A Head Start
If you want an earlier harvest, start lemongrass indoors 6 to 8 weeks before the last frost. This means starting seeds or stalks in March or April.
- Plant stalks in small pots with well-draining soil
- Place them in a sunny window or under grow lights
- Keep soil moist but not waterlogged
- Harden off plants for a week before transplanting outdoors
Transplanting hardened seedlings in late May gives them a strong advantage. They will establish roots faster than direct-planted stalks.
Preparing Your Garden For Lemongrass
Choose a location that gets full sun for at least 6 hours daily. Lemongrass loves heat and light. Partial shade will reduce growth and flavor.
Soil should be rich, loamy, and well-draining. Add compost or aged manure before planting. A pH between 6.5 and 7.0 is ideal.
Step-By-Step Planting Guide
- Wait until soil temperature reaches 65°F
- Dig holes 12 inches apart for each stalk
- Place stalks 2 inches deep, covering the root base
- Water thoroughly after planting
- Mulch around plants to retain moisture and suppress weeds
Space rows 24 inches apart if planting multiple stalks. Lemongrass grows into clumps that spread, so give them room.
Caring For Lemongrass Through The Season
Water regularly, especially during dry spells. Lemongrass needs about 1 inch of water per week. Drip irrigation works well to keep leaves dry and prevent fungal issues.
Fertilize every 4 weeks with a balanced liquid fertilizer. Use a 10-10-10 formula or fish emulsion. Stop fertilizing in late August to let plants harden off for winter.
Pest And Disease Management
Lemongrass is generally pest-resistant. Spider mites and aphids can appear in hot weather. Spray them off with a strong hose stream or use insecticidal soap.
Root rot occurs in poorly drained soil. Avoid overwatering and plant in raised beds if your soil is heavy clay.
Harvesting Lemongrass Before Frost
Harvest stalks when they are about 12 inches tall and at least half an inch thick. Cut stalks at ground level using sharp shears. Leave the central clump to regrow.
In New Hampshire, the first frost usually arrives between late September and mid-October. Monitor weather forecasts closely. Cover plants with row covers if a light frost is predicted.
Storing And Using Fresh Lemongrass
- Refrigerate fresh stalks in a plastic bag for up to 2 weeks
- Freeze whole stalks for up to 6 months
- Dry stalks in a dehydrator for long-term storage
- Use fresh in teas, soups, and stir-fries
Lemongrass freezes well without losing flavor. Simply wash, dry, and place in freezer bags. You can chop it frozen for recipes.
Overwintering Lemongrass In New Hampshire
Lemongrass is not hardy in USDA zones 5 and below. New Hampshire is zones 4 to 6. You must bring plants indoors before frost.
Dig up a clump in early October. Trim leaves to 6 inches tall. Pot it in a container with fresh soil. Place in a bright, cool room indoors. Water sparingly through winter.
Alternatively, take cuttings from stalks and root them in water. Plant them in pots for next spring. This gives you a fresh supply without storing large clumps.
Common Mistakes To Avoid
- Planting too early in cold soil
- Overwatering, which causes root rot
- Planting in shade, leading to weak growth
- Forgetting to harden off indoor starts
- Waiting too long to harvest before frost
One mistake is ignoring microclimates in your yard. South-facing slopes warm up faster in spring. Use these spots to plant a week earlier than open areas.
Varieties Of Lemongrass For New Hampshire
East Indian lemongrass (Cymbopogon flexuosus) is the most common culinary type. It grows well in containers and garden beds. West Indian lemongrass (Cymbopogon citratus) is also suitable but slightly less cold-tolerant.
Choose disease-free stalks from a nursery or grocery store. Organic stalks often root better than treated ones. Avoid dried or wilted stalks.
Container Growing Tips
If you have limited space, grow lemongrass in pots. Use a 5-gallon container with drainage holes. Fill with potting mix and compost.
- Place pot in full sun
- Water when top inch of soil feels dry
- Fertilize monthly during growing season
- Move pot indoors before first frost
Container plants are easier to overwinter. You can keep them in a garage or basement with minimal light. They will go dormant and regrow in spring.
Frequently Asked Questions
Can I plant lemongrass in New Hampshire in August?
It is not recomended. August planting leaves too few frost-free days for the plant to mature. You may get small stalks, but they likely won’t survive winter.
What is the latest time to plant lemongrass in New Hampshire?
The latest safe planting date is mid-July. This gives the plant at least 60 days before the first frost. Expect smaller harvests from late plantings.
Should I use seeds or stalks for planting lemongrass?
Stalks are easier and faster. Seeds take longer to germinate and require warm indoor conditions. Most gardeners in New Hampshire use stalks from grocery stores or nurseries.
How do I know if the soil is warm enough for lemongrass?
Use a soil thermometer inserted 4 inches deep. Wait until the reading is consistently above 65°F for several days. Cold soil will delay growth and may kill the plant.
Can lemongrass survive winter in New Hampshire if mulched heavily?
No. Even with heavy mulch, lemongrass cannot survive ground freezes in New Hampshire. You must bring it indoors or treat it as an annual. Mulch only helps in milder climates.
Final Tips For Success
Plant lemongrass in a raised bed if your soil drains poorly. Raised beds warm up faster in spring, giving you an extra week of growing time.
Group lemongrass with other heat-loving plants like basil and peppers. They share similar water and sun needs. This simplifies garden care.
Harvest regularly to encourage new growth. Cut outer stalks first, leaving the center to produce more. A well-maintained clump can yield stalks all summer.
If you miss the planting window, don’t worry. You can still buy started plants from local nurseries in June. They are already hardened off and ready to go in the ground.
Remember that lemongrass is a heavy feeder. Add compost mid-season to keep it vigorous. Yellowing leaves indicate a nitrogen deficiency. Apply a quick-release fertilizer to fix it.
With proper timing and care, you can enjoy fresh lemongrass from your New Hampshire garden from July through September. The key is planting after the last frost and giving it consistent warmth and moisture.
Start planning your garden layout now. Mark the planting date on your calendar. When late May arrives, you will be ready to put your lemongrass in the ground and watch it thrive.