Missouri’s transition zone climate provides a generous planting window from mid-April through early June for lemongrass. Knowing the best time to plant lemon grass in missouri is key to getting a strong harvest before the first frost hits in fall.
Lemongrass loves heat and humidity, two things Missouri summers deliver in spades. But this tropical grass has zero tolerance for cold soil or frost. Plant too early, and you risk losing it. Plant too late, and it won’t have time to mature.
This guide walks you through the exact timing, soil prep, and care steps you need. No fluff, just practical advice for Missouri gardeners.
Best Time To Plant Lemon Grass In Missouri
The ideal window runs from April 15 to June 5 for most of the state. In southern Missouri (zones 6b-7a), you can start as early as April 10. In northern areas (zones 5b-6a), wait until May 1 to be safe.
Why this range? Lemongrass needs soil temperatures consistently above 60°F (16°C) to grow roots. Air temps should stay above 50°F at night. Missouri’s spring weather is famously unpredictable, so watching the forecast matters more than the calendar date.
Check Your Last Frost Date First
Your local last frost date is the single most important number. Lemongrass dies if exposed to freezing temps. Even a light frost (32°F) will kill it.
- St. Louis area: Last frost typically around April 10-15
- Kansas City area: Last frost around April 15-20
- Springfield area: Last frost around April 10-15
- Columbia area: Last frost around April 15-20
- Northern Missouri (Kirksville, Maryville): Last frost around April 25-May 5
Wait at least two weeks after your last frost date before planting lemongrass outdoors. This buffer protects against late cold snaps, which happen often in Missouri.
Soil Temperature Matters More Than Air Temp
Lemongrass roots won’t grow in cold dirt. Use a soil thermometer to check. Insert it 4 inches deep in the morning. If it reads below 60°F, hold off.
In Missouri, soil warms slowly in spring. Black clay soils in the Bootheel warm faster than heavy loam in the Ozarks. Raised beds and south-facing slopes warm up earlier too.
Pro tip: Lay black plastic over your planting area for two weeks before planting. This traps heat and raises soil temps by 5-10°F.
How To Plant Lemongrass In Missouri
Lemongrass is almost always grown from starts or divisions, not seeds. Seeds take too long and have low germination rates. Buy starter plants from a nursery or use stalks from the grocery store.
Step 1: Choose Healthy Starts
Look for firm stalks with green leaves. Avoid plants with yellowing, mushy bases, or dried-out roots. If using grocery store stalks, pick ones with the root base still attached.
- Nursery starts: Ready to plant immediately
- Grocery store stalks: Place in water for 2-3 weeks until roots appear
- Division from a friend’s plant: Best done in late spring
Step 2: Prepare The Planting Site
Lemongrass needs full sun (at least 6-8 hours daily) and well-draining soil. Missouri’s clay soil holds too much water, which rots the roots. Fix this by:
- Digging a hole 12 inches deep and 12 inches wide
- Mixing in 3-4 inches of compost or aged manure
- Adding 2 inches of coarse sand or perlite for drainage
- Testing drainage: Fill the hole with water. If it drains within 30 minutes, you’re good.
Space plants 24-36 inches apart. Lemongrass grows into large clumps, up to 4 feet tall and 3 feet wide. Give it room.
Step 3: Plant At The Right Depth
Set the plant so the base of the stalks sits at soil level. Burying the stalks too deep invites rot. Planting too high exposes roots to air and drying.
Water thoroughly after planting. Keep the soil consistently moist for the first two weeks while roots establish.
Step 4: Mulch Heavily
Missouri summers get hot and dry. A 3-4 inch layer of organic mulch (straw, shredded leaves, or wood chips) helps:
- Retain soil moisture
- Keep roots cool
- Suppress weeds
- Add organic matter as it decomposes
Keep mulch 2 inches away from the stalks to prevent stem rot.
Caring For Lemongrass Through Missouri’s Seasons
Once planted, lemongrass needs regular care. Missouri’s weather swings from humid summers to cold winters. Your plant care changes with the seasons.
Summer Care (June-August)
This is prime growing season. Lemongrass thrives in heat and humidity. Water deeply once a week if rain is scarce. In drought periods, water twice weekly.
Fertilize monthly with a balanced 10-10-10 fertilizer or fish emulsion. Apply according to package directions. Too much nitrogen makes the stalks weak and floppy.
Watch for spider mites in dry spells. A strong spray of water from the hose knocks them off. Avoid chemical pesticides that harm beneficial insects.
Fall Care (September-October)
Lemongrass is tender perennial in Missouri. It might survive winter in zone 7a (southern Bootheel) with heavy mulch, but most gardeners treat it as an annual or overwinter indoors.
Stop fertilizing by September 1. This lets the plant slow down naturally. Harvest stalks before the first frost. Cut stalks at soil level with a sharp knife.
If you want to overwinter the plant:
- Dig up the entire clump before the first frost
- Trim leaves to 6 inches tall
- Pot in a container with fresh potting soil
- Place in a bright, cool room (60-70°F)
- Water sparingly through winter
Winter Care (November-March)
For plants left in the ground, cut all stalks to 2 inches above soil after the first frost kills the leaves. Pile 6-8 inches of straw or leaves on top. Cover with a frost blanket or burlap.
This only works in protected spots and mild winters. Most Missouri winters drop below 20°F, which kills lemongrass roots. Overwintering indoors is more reliable.
Indoor plants need bright light. A south-facing window or grow lights work. Water only when the top inch of soil feels dry. Too much water causes root rot in winter.
Spring Care (April-May)
In mid-April, start hardening off indoor plants. Set them outside for a few hours each day, increasing time over two weeks. Bring them in at night if frost threatens.
For overwintered outdoor plants, remove mulch gradually as temps warm. Watch for new shoots emerging from the base. If none appear by May 1, the plant likely died. Replace with a new start.
Common Problems Planting Lemongrass In Missouri
Even with perfect timing, issues arise. Here are the most common problems and quick fixes.
Problem 1: Stalks Turn Yellow Or Brown
Cause: Overwatering or poor drainage. Missouri clay holds water too long.
Fix: Improve drainage by adding sand or planting in raised beds. Water only when top 2 inches of soil are dry.
Problem 2: Leaves Have Brown Tips
Cause: Low humidity or underwatering. Missouri summers get dry spells.
Fix: Water deeply and mulch. Mist leaves in extreme heat.
Problem 3: Plant Grows Slowly Or Stays Small
Cause: Not enough sun or nutrients. Lemongrass is a heavy feeder.
Fix: Move to full sun. Fertilize monthly with balanced fertilizer.
Problem 4: Stalks Fall Over Or Break
Cause: Wind damage or weak growth from too much nitrogen.
Fix: Stake plants in windy areas. Reduce nitrogen fertilizer.
Problem 5: Plant Dies After First Frost
Cause: Planted too late or not protected.
Fix: Plant earlier next year. Harvest before frost or overwinter indoors.
Harvesting Lemongrass In Missouri
You can start harvesting about 90 days after planting. Stalks are ready when they’re at least 1/2 inch thick at the base. Cut stalks at soil level with a sharp knife or pruners.
Harvest in the morning when stalks are crisp. Avoid taking more than one-third of the stalks at once. This lets the plant keep growing.
For the best flavor, harvest before the plant flowers. Flowering makes stalks tough and less flavorful. In Missouri, flowering happens in late August to September.
Store fresh stalks in the refrigerator for up to 3 weeks. Wrap in a damp paper towel and place in a plastic bag. Or freeze chopped stalks for up to 6 months.
Using Lemongrass From Your Missouri Garden
Lemongrass is a culinary powerhouse. Use it fresh, dried, or frozen in:
- Thai soups like Tom Yum
- Curry pastes and stir-fries
- Herbal teas (steep fresh stalks in hot water)
- Marinades for chicken, fish, or tofu
- Infused water or cocktails
To use, peel off the tough outer layers. Use only the tender white base and the inner core. Crush or slice thinly before adding to dishes.
Lemongrass also repels mosquitoes naturally. Plant it near patios or seating areas. Crush a leaf and rub it on skin for a mild repellent effect.
Frequently Asked Questions
Can I Plant Lemongrass Seeds Directly In Missouri Soil?
Yes, but it’s not recommended. Seeds need warm soil (70°F+) and take 2-3 weeks to germinate. Missouri’s short growing season means seeds often don’t produce mature stalks before frost. Start seeds indoors 8-10 weeks before your last frost date for best results.
What Happens If I Plant Lemongrass Too Early In Missouri?
Cold soil stops root growth. The plant may survive but stay stunted all season. A late frost can kill it outright. Wait until soil temps reach 60°F and all frost danger passes.
Can Lemongrass Survive Winter In Missouri Without Protection?
Only in the southernmost parts of the Bootheel (zone 7a) and only with heavy mulch. Most Missouri winters kill lemongrass left in the ground. Overwintering indoors is the safest bet.
How Do I Know If My Lemongrass Is Ready To Harvest?
Stalks should be at least 1/2 inch thick at the base and feel firm. The plant should have at least 6-8 stalks before you start harvesting. Cut stalks at soil level, leaving the inner stalks to keep growing.
Should I Plant Lemongrass In A Container In Missouri?
Yes, containers work great. They warm up faster in spring, drain better than clay soil, and are easy to move indoors for winter. Use a pot at least 12 inches deep with drainage holes. Place in full sun.
Final Tips For Success
Lemongrass is one of the easiest herbs to grow in Missouri if you get the timing right. Stick to the mid-April to early June window. Watch your local frost dates. Check soil temperature before planting.
Give it full sun, good drainage, and consistent moisture. Mulch heavily. Harvest regularly to encourage new growth. And if you want to keep it year after year, dig it up and bring it inside before the first frost.
With these steps, you’ll have fresh lemongrass from your Missouri garden all summer long. No need to buy overpriced stalks at the grocery store. Grow your own and enjoy the flavor and the mosquito protection.
One last thing: lemongrass is a heavy feeder. Don’t skip the monthly fertilizer. A well-fed plant grows faster, tastes better, and resists pests. Your Missouri summer heat is exactly what it needs to thrive.
So get your soil thermometer ready, watch the forecast, and plant at the right time. Your taste buds (and your patio guests) will thank you.