Growing lemongrass in USDA Zone 2 means gardening in one of the coldest, shortest seasons in the United States. The average last spring frost falls in the Jun 1-15 range and the average first autumn frost in the Aug 15-Sep 1 range, leaving roughly eleven frost-free weeks in an average year. Those are USDA/NOAA zone averages, not promises for any one garden - check your local extension service. This guide covers when to plant lemongrass zone 2.
Zone 2 at a glance
USDA Zone 2 has average winter lows of -50 to -40F, and frost can arrive in late August and linger into mid-June. Choose varieties rated for very cold climates, start indoors where the crop allows it, and protect plants at both ends of the season - a cold frame, cloche or low tunnel is often the difference between a harvest and an empty bed.
| Detail | Zone 2 guidance |
|---|---|
| Average last spring frost | Jun 1-15 (average/range) |
| Average first autumn frost | Aug 15-Sep 1 (average/range) |
| Winter lows | -50 to -40F |
| Days to germination | 10–21 days |
| Days to maturity | 90–120 days |
| Sowing method | start indoors |
| Cold tolerance | tender |
| Sun | full sun |
| Soil pH | 6.0–7.0 |
| Spacing | 24–36 inches |
| Water needs | moderate |
When to plant lemongrass in Zone 2
Start seeds or divisions indoors 8-10 weeks before the average last frost, roughly late March to mid-April, and move plants outside only after the average last frost, in the Jun 1-15 window, when nights stay warm. Lemongrass needs 90-120 days to maturity, so a plant moved out in mid-June reaches harvest size roughly in mid-September to mid-October, after the average first frost. That is the central Zone 2 problem for this crop: treat it as a container plant you grow for one warm season, harvest before the first frost, and bring a potted plant indoors if you want to keep it.
Work back from the frost dates rather than from a calendar date: the planting calendar hub gives the Zone 2 picture month by month, and the frost date calculator turns your frost averages into sowing dates.
Starting lemongrass in Zone 2
Lemongrass is slow from seed, germinating in 10-21 days, so many Zone 2 gardeners start with a nursery plant or a rooted stalk instead. Give seedlings strong light - a sunny windowsill at minimum, a grow light hung close above them is better - and pot them up as they grow so they are sturdy, well-rooted plants by June, not thin seedlings. Harden them off for a week to ten days before they go outside, putting them out for a few hours a day in a sheltered spot and bringing them in if frost is forecast.
In Zone 2, soil temperature matters as much as air temperature: a raised bed warms earlier, and black plastic laid over the bed for a week or two warms the soil before planting. Do not rush tender plants into cold soil.
Soil, spacing, sun and water
Lemongrass grows best in full sun, in soil with a pH of 6.0–7.0. Test your soil through your local extension service rather than guessing, and dig in well-rotted compost before planting to improve drainage and moisture holding Space plants 24–36 inches apart - it is tempting to crowd plants in during a short season, but crowded plants stay small and invite disease, so use the plant spacing calculator if you are laying out a bed. Lemongrass needs moderate water: water deeply and less often rather than lightly every day, water at the base in the morning so leaves dry before night, and mulch to keep the soil evenly moist. Check the soil a finger's depth down and water when it feels dry there.
Companion planting
Good companions for lemongrass include tomatoes, peppers, marigolds, cabbage. The companion planting finder can suggest combinations for your whole bed. Rotate crops each year and avoid planting lemongrass where the same family (Poaceae) grew last year.
Pests and problems
The common pests and problems to watch for with lemongrass are aphids, slugs, cutworms. Inspect plants regularly, especially the undersides of leaves, and act early: hand-pick larger pests, wash aphids off with a strong jet of water, and remove badly affected leaves rather than waiting for the problem to spread. Healthy plants in the right soil and spacing resist pests better than stressed ones. If you are unsure what is eating your plants, the pest identifier helper can help narrow it down.
Cold is the biggest problem in Zone 2, ahead of any pest: a late spring frost or an early autumn frost can end the season overnight, so keep row cover ready and cover plants whenever frost is forecast.
Harvest and storage
Allow 90–120 days from sowing or transplanting to harvest, and pick regularly rather than leaving everything to ripen at once. Pick in the morning, handle gently to avoid bruising, and use promptly or freeze, dry or preserve the surplus. The harvest date calculator can turn your sowing or transplant date into a harvest window to watch for. If frost is forecast before the crop has finished, pick what you can rather than losing it to one cold night.
In Zone 2 lemongrass is not hardy outdoors and will not survive the winter in the ground, where winter lows fall to -50 to -40F. Grow it in a large pot you can move, keep it in the warmest, sunniest spot you have, and plan to harvest the whole plant before the first autumn frost. If you bring a pot indoors before frost, keep it in your brightest window and water sparingly through winter.
Related Zone 2 guides in this series: Tarragon and Bay Leaves - and the planting calendar hub for the full Zone 2 year.
Frequently asked questions
When should I plant lemongrass in Zone 2?
Work back from the average last frost in the Jun 1-15 range: start indoors where needed, sow hardy crops a few weeks before that date, and do not put tender plants outside until frost is past.
Can I grow lemongrass outdoors in Zone 2?
Yes, with the right variety and timing - but be realistic. The frost-free window runs roughly from early June to mid-August or early September, so choose varieties rated for very cold climates, start indoors where the crop allows it, and use a cloche or low tunnel for tender crops.
How long does lemongrass take to grow in Zone 2?
Seeds germinate in 10–21 days, and the crop takes 90–120 days to maturity. In Zone 2, cool soil can slow growth, so allow the longer end of the range - and for perennial fruit and trees, count the wait in years, not weeks.
What soil and spacing does lemongrass need in Zone 2?
Lemongrass needs full sun and soil pH 6.0–7.0, spaced 24–36 inches apart. Dig in well-rotted compost, water deeply, mulch, and test your soil through your local extension service rather than guessing.