Iowa’s short growing season means lemongrass thrives when planted in early June, once nighttime temperatures stay reliably above 50°F. Knowing the best time to plant lemon grass in iowa is the single most important step for a successful harvest. This guide walks you through exactly when and how to plant, care for, and enjoy fresh lemongrass in your Iowa garden.
Best Time To Plant Lemon Grass In Iowa
Lemongrass is a tropical plant, native to warm climates. It simply cannot handle frost. In Iowa, the last frost date varies by zone, but generally falls between late April and mid-May. Even after the last frost, the soil and air need to warm up.
Planting too early, when nights are still cool, will stunt growth or kill the plant. Planting too late means you might not get a full harvest before the first fall frost. The sweet spot is early June.
Here’s a simple timeline for Iowa gardeners:
- Late May: Start checking nighttime temperatures. If they stay above 50°F for a week, you can start hardening off transplants.
- Early June: This is your target planting window. Soil temperatures should be at least 60°F.
- Mid-June: Still okay, but you lose a few weeks of growing time.
- Late June: Risky for a full harvest, especially in northern Iowa.
Remember, lemongrass is not a perennial in Iowa. You will treat it as an annual, or overwinter it indoors. Timing your planting right gives you the best shot at a bountiful crop.
Understanding Iowa’s Climate Zones
Iowa spans USDA hardiness zones 4b to 5b. This means winters are cold and summers can be hot and humid. Your specific location matters.
Northern Iowa (zones 4b-5a) has a shorter growing season. You might want to plant a bit earlier if you use a cold frame or row cover. Southern Iowa (zone 5b) can sometimes plant in late May if the weather cooperates.
Always check your local frost dates. The Iowa State University Extension has excellent resources. A simple rule: wait until the soil is warm to the touch and all danger of frost has passed.
Why Early June Is The Sweet Spot
Lemongrass needs consistent warmth. Nighttime temperatures below 50°F cause stress. The plant may survive, but it won’t grow vigorously. Early June usually brings stable warm nights across most of Iowa.
Another reason: day length. Lemongrass grows best with long, sunny days. June offers the longest days of the year. This gives your plants a strong start.
If you plant in early June, you have about 100-120 days before the first fall frost. That is enough time for lemongrass to reach a harvestable size of 12-18 inches tall.
How To Prepare For Planting Lemongrass
Good preparation makes all the difference. You can’t just stick a stalk in the ground and hope for the best. Here is a step-by-step plan.
Choose The Right Variety
Not all lemongrass is the same. For cooking, you want Cymbopogon citratus. This is the common culinary lemongrass. Avoid ornamental varieties, which are tough and not flavorful.
You can buy starts from nurseries or online. Some gardeners have success with store-bought stalks. Look for firm, fresh stalks with the base intact. Place them in water until roots form.
Start Indoors Or Buy Transplants
In Iowa, starting from seed is possible but tricky. Lemongrass seeds need warmth and light. Start them indoors 8-10 weeks before your last frost date. Use a heat mat and grow lights.
Most Iowa gardeners buy transplants. This saves time and ensures a strong start. Look for healthy, green plants at local garden centers in late May or early June.
If you want to grow from store-bought stalks, here is a simple method:
- Buy fresh lemongrass stalks with the root end intact.
- Trim the top leaves, leaving about 6 inches of stalk.
- Place the stalks in a glass of water, root end down.
- Change the water every few days.
- After 2-3 weeks, roots and new shoots will appear.
- Plant outdoors after the danger of frost has passed.
Harden Off Your Plants
Transplants need to adjust to outdoor conditions. This process is called hardening off. Start about a week before planting.
Place your lemongrass outside in a sheltered spot for a few hours each day. Gradually increase the time and sunlight exposure. Bring them inside if frost is forecast.
This step reduces transplant shock. Your plants will grow stronger and faster once in the ground.
Where To Plant Lemongrass In Iowa
Location is key. Lemongrass needs full sun and well-draining soil. It also appreciates some protection from strong winds.
Sunlight Requirements
Lemongrass craves at least 6-8 hours of direct sunlight daily. More is better. In Iowa’s climate, full sun is essential for good growth. A south-facing spot is ideal.
If you have a hot, sunny spot near a wall or fence, that works well. The reflected heat helps the plant thrive.
Soil Preparation
Lemongrass prefers slightly acidic to neutral soil (pH 6.0-7.5). It needs good drainage. Heavy clay soil can cause root rot.
Before planting, amend your soil with compost or well-rotted manure. This improves drainage and adds nutrients. If your soil is very heavy, consider raised beds or containers.
Here is a simple soil test: grab a handful of moist soil. Squeeze it. If it forms a tight ball that doesn’t crumble, it has too much clay. Add sand or compost to loosen it.
Container Growing
Many Iowa gardeners grow lemongrass in containers. This makes it easy to move indoors for winter. Use a pot at least 12 inches deep and wide. Ensure it has drainage holes.
Use a high-quality potting mix. Add slow-release fertilizer at planting time. Container-grown lemongrass needs more frequent watering than in-ground plants.
Step-By-Step Planting Guide
Once your soil is ready and the weather is warm, it’s time to plant. Follow these steps for success.
When To Plant: The Exact Date
For most of Iowa, the best time to plant lemon grass in iowa is the first week of June. Check your local forecast. Aim for a stretch of warm, sunny days.
If you are in southern Iowa, you might plant in late May. In northern Iowa, wait until mid-June. The key is consistent nighttime temperatures above 50°F.
How To Plant
- Dig a hole twice as wide as the root ball and just as deep.
- Space plants 18-24 inches apart. Lemongrass grows into large clumps.
- Gently remove the plant from its pot. Loosen any circling roots.
- Place the plant in the hole. The top of the root ball should be level with the soil surface.
- Backfill with soil and press down gently.
- Water thoroughly after planting.
Mulching And Watering
Apply a 2-3 inch layer of organic mulch around the base. This conserves moisture, suppresses weeds, and keeps roots cool. Straw, shredded leaves, or grass clippings work well.
Water deeply once a week, more often during hot, dry spells. Lemongrass likes consistent moisture but not soggy soil. Stick your finger in the soil. If it feels dry an inch down, water.
Caring For Lemongrass Through The Season
Once planted, lemongrass is relatively low-maintenance. A few simple tasks will keep it healthy and productive.
Fertilizing
Lemongrass is a heavy feeder. Apply a balanced fertilizer (10-10-10) every 4-6 weeks during the growing season. Or use a slow-release fertilizer at planting time.
Organic options include fish emulsion or compost tea. Apply according to package directions. Too much nitrogen can cause lush leaves but weak stalks.
Pest And Disease Control
Lemongrass is generally pest-resistant. In Iowa, you might see spider mites or aphids. A strong spray of water often dislodges them. Neem oil works for serious infestations.
Root rot is the main disease risk. Avoid overwatering and ensure good drainage. If leaves turn yellow and mushy, reduce watering.
Pruning And Harvesting
You can start harvesting when the stalks are about 12 inches tall. Cut stalks at ground level. Use a sharp knife or pruners. Leave at least half the plant to continue growing.
Harvest in the morning when the stalks are crisp. Lemongrass leaves can also be used for tea. Just cut the leafy tops and dry them.
Regular harvesting encourages new growth. Don’t let the plant get too crowded. Thin out older stalks to improve air circulation.
Extending The Growing Season
Iowa’s first frost usually arrives in late September or early October. You can extend your lemongrass harvest with a few tricks.
Using Row Covers
Lightweight row covers protect plants from light frost. They add a few degrees of warmth. Use them in early spring or late fall.
Drape the cover over hoops or directly on the plants. Secure the edges with soil or rocks. Remove during the day if temperatures rise above 80°F.
Overwintering Indoors
Lemongrass is a perennial in warm climates. In Iowa, you can bring it indoors for winter. This is easier with container-grown plants.
Before the first frost, dig up your lemongrass or move the pot indoors. Cut back the leaves to about 6 inches. Place it in a sunny window or under grow lights.
Water sparingly during winter. The plant will go dormant. In spring, resume regular watering and fertilizing. Move it back outdoors after the last frost.
Common Mistakes And How To Avoid Them
Even experienced gardeners make mistakes. Here are the most common ones with lemongrass in Iowa.
Planting Too Early
This is the biggest mistake. Cold soil and air stunt growth. Your plant may survive but never reach full size. Always wait for warm nights.
Overwatering
Lemongrass likes moisture, but soggy soil causes root rot. Ensure good drainage. Water deeply but infrequently.
Underestimating Growth
Lemongrass can grow 3-4 feet tall and wide. Give it enough space. Crowded plants compete for nutrients and sunlight.
Ignoring Frost Warnings
A single frost can kill lemongrass. Watch the weather forecast in fall. Be ready to harvest or move plants indoors.
Harvesting And Storing Lemongrass
Knowing when and how to harvest ensures you get the most from your plants.
When To Harvest
Harvest in late summer or early fall, before the first frost. Stalks should be at least 12 inches tall and firm. The base should be pale green or white.
You can harvest a few stalks at a time throughout the season. For a big harvest, cut all stalks at once before frost.
How To Store
Fresh lemongrass keeps in the refrigerator for 2-3 weeks. Wrap stalks in a damp paper towel and place in a plastic bag.
For long-term storage, freeze lemongrass. Chop the stalks into small pieces and freeze in a sealed bag. You can also dry the leaves for tea.
Another option: make lemongrass paste. Blend fresh stalks with a little oil. Freeze in ice cube trays. Pop out a cube when needed.
Frequently Asked Questions
Can I plant lemongrass in Iowa in July?
July is late but possible. You will have a shorter harvest window. Choose fast-growing varieties and provide extra care. The best time to plant lemon grass in iowa is early June for maximum yield.
Does lemongrass come back every year in Iowa?
No. Lemongrass is not winter-hardy in Iowa. It will die if left outside in freezing temperatures. You must treat it as an annual or overwinter it indoors.
Can I grow lemongrass from seed in Iowa?
Yes, but it requires patience. Start seeds indoors 8-10 weeks before the last frost. Use a heat mat and grow lights. Transplants are easier for most gardeners.
How much sun does lemongrass need?
At least 6-8 hours of direct sunlight daily. Full sun is best for strong growth. Partial shade will result in smaller, weaker plants.
What is the best fertilizer for lemongrass?
A balanced fertilizer like 10-10-10 works well. Apply every 4-6 weeks during the growing season. Organic options include compost tea or fish emulsion.
Final Tips For Iowa Gardeners
Growing lemongrass in Iowa is rewarding. The fresh flavor is unmatched. With the right timing and care, you can enjoy a bountiful harvest.
Remember these key points:
- Plant in early June when nights are warm.
- Choose a sunny, well-drained spot.
- Water consistently but don’t overwater.
- Harvest before the first frost.
- Consider container growing for easy overwintering.
Dont be afraid to experiment. Lemongrass is forgiving once established. With a little attention, you’ll have fresh stalks for teas, soups, and stir-fries all summer long.
One last thing: share your harvest with friends. Fresh lemongrass is a rare treat in Iowa. Your garden will be the talk of the neighborhood.