Transplanting is the moment a young vegetable leaves the safety of its pot or tray and goes into the ground — and it is a shock, however carefully you do it. Roots are disturbed, leaves face wind and sun for the first time, and the soil is colder and drier than the compost it came from. Done well, transplanting gives you weeks of extra growing season and strong, early plants. Done badly, it sets plants back for weeks or kills them outright. This guide covers vegetables transplanting properly: which vegetables transplant well and which should never be moved, how to harden plants off, the right planting depth and spacing, and the aftercare that helps transplants settle in. The timings below use published ranges for common vegetables, which vary by variety, climate and soil. As with everything in this guide, check your local extension service for advice suited to your area.
The first rule is to know which vegetables tolerate transplanting and which do not. Tomatoes, peppers, eggplant, brassicas, lettuce and leeks transplant well — they are the reason seed starting indoors exists. Cucumbers, zucchini, squash and melons transplant acceptably if handled gently and moved young, before their roots fill the pot. Carrots, parsnips, radishes, beans, peas and sweet corn should never be transplanted: their roots dislike disturbance, and a transplanted carrot forks, a transplanted bean sulks for weeks, and a transplanted pea rarely recovers. Sow those direct, where they are to grow, and save your transplanting effort for the vegetables that reward it.
Which vegetables transplant well — and which never should
| Vegetable | Transplant? | Days to maturity | Transplant notes |
|---|---|---|---|
| Tomatoes | Yes — excellent | 60–85 | Plant deep, up to the first leaves; roots form along the buried stem |
| Bell peppers | Yes | 60–90 | Plant at the same depth; needs warm soil |
| Eggplant | Yes | 70–85 | Plant at the same depth; needs warm soil |
| Broccoli | Yes | 60–85 | Plant at the same depth; water well |
| Cabbage | Yes | 60–90 | Plant at the same depth; firm the soil around the stem |
| Cauliflower | Yes | 55–80 | Plant at the same depth; keep well watered |
| Kale | Yes | 50–65 | Hardy; transplants easily |
| Lettuce | Yes | 45–60 | Plant at the same depth; do not bury the crown |
| Leeks | Yes | 90–120 | Plant deep in a hole; water in, do not fill the hole |
| Onions (from seed) | Yes | 90–120 | Plant shallow; do not bury the bulb |
| Cucumbers | Yes, if young | 50–70 | Move before roots fill the pot; handle gently |
| Zucchini | Yes, if young | 45–55 | Move before roots fill the pot; handle gently |
| Carrots | No — never | 60–80 | Direct sow only; transplanted roots fork |
| Parsnips | No — never | 100–130 | Direct sow only; transplanted roots fork |
| Radishes | No — never | 25–40 | Direct sow only; too fast to need it |
| Green beans | No — never | 50–65 | Direct sow only; roots dislike disturbance |
| Peas | No — never | 60–70 | Direct sow only; roots dislike disturbance |
| Sweet corn | No — never | 60–90 | Direct sow only; needs a block for pollination |
Tomatoes are the best transplanting vegetable of all, because they are the only common vegetable that benefits from being planted deep: bury the stem up to the first set of leaves, and roots form all along the buried stem, giving you a stronger plant. Leeks are the other special case: plant them deep in a hole made with a dibber, water them in, and do not fill the hole — the leek fills it as it grows, and the deep planting blanches the stem white. Lettuce must be planted at the same depth, with the crown above soil level — bury the crown and the plant rots. The growing guide for tomatoes and the growing guide for broccoli cover the two most-transplanted vegetables in detail, and the seed starting calculator helps you time sowings so transplants are ready when the weather is.
Hardening off: the step you must not skip
Hardening off is the gradual process of getting indoor seedlings used to outdoor conditions, and skipping it is the most common reason transplants fail. A seedling raised indoors in still, warm air has soft leaves and a thin skin; put it straight outside and the wind, sun and cold will scorch it, wilt it, or kill it. Harden plants off over 7–10 days: put them outside in a sheltered, shady spot for a few hours on the first day, bring them in at night, and increase the time outside and the exposure to sun and wind a little each day. By the end of the week they should be outside all day and night, unless frost threatens.
Start hardening off about a week before you plan to plant out, and watch the weather — a cold night or a gale can undo a week of hardening, so bring plants in if conditions turn bad. Hardy vegetables such as peas, lettuce, spinach, kale, broccoli and cabbage can be hardened off earlier and planted out earlier than tender ones. Tender vegetables — tomatoes, peppers, eggplant, cucumbers, zucchini, beans — must wait until after the last frost and until the soil has warmed up. A tomato planted into cold soil sits and sulks for weeks, growing no faster than a tomato planted two weeks later into warm soil.
Planting depth and spacing
Planting depth varies by vegetable, and getting it wrong causes real problems. Tomatoes go deep — bury the stem up to the first leaves. Leeks go deep — plant them in a hole 6 inches deep. Lettuce, cabbage, broccoli and kale go at the same depth they grew in the pot, with the crown or growing point above soil level. Peppers and eggplant go at the same depth. Onions go shallow, with the bulb just below the surface. Burying a lettuce crown or a cabbage growing point causes rot; planting a tomato shallow wastes the chance to grow extra roots.
Spacing matters just as much. Give tomatoes 24–36 inches, peppers and eggplant 18–24 inches, broccoli and cauliflower 18–24 inches, cabbage 12–24 inches, lettuce 8–12 inches, and kale 12–18 inches. Crowded transplants compete for light, water and food, and damp, airless foliage invites disease. The plant spacing calculator helps you fit transplants into your beds, and the vegetables spacing guide gives the spacing for each vegetable. Dig a hole slightly larger than the root ball, water the hole before planting, set the plant in, firm the soil gently around it — not hard, which compacts it — and water again.
The transplanting itself: a step-by-step method
Water the seedlings well an hour or two before transplanting, so the compost holds together and the roots are hydrated. Water the bed too, so the soil is moist when the plant goes in. Choose a cloudy day or plant in the evening if you can — hot sun on a fresh transplant is the fastest way to wilt it. Handle seedlings by a leaf, never by the stem, which bruises easily and may never recover. Squeeze the pot gently to loosen the root ball, tip the plant out into your hand, and set it into the hole at the right depth.
If the roots are circling the bottom of the pot — root-bound — tease them out gently with your fingers before planting, so they grow outwards into the soil instead of continuing in a circle. Do not pull the plant out of the pot by its stem. After planting, firm the soil gently, water well to settle the soil around the roots, and mulch around the plant — keeping mulch a few inches from the stem — to hold moisture in. If a cold night or strong wind is forecast, cover tender transplants with a cloche, a bucket, or fleece for the first few nights. The vegetables watering guide covers the watering that helps transplants settle, and the mulching vegetables guide covers mulching methods.
Aftercare and transplant shock
Transplant shock is normal: a transplant may wilt, droop or stop growing for a few days after planting, while its roots settle in. It is not a sign of failure — it is the plant adjusting. Keep the soil moist but not waterlogged for the first week or two, shade tender transplants in the hottest part of the day if you can, and do not feed them until they show new growth, which means the roots have taken hold. A transplant that is still wilted after a week, or whose leaves are yellowing and dropping, is in trouble: check whether the soil is too wet or too dry, whether the plant was buried too deep, or whether a pest such as cutworms has attacked the stem at soil level.
Cutworms are the main transplant pest: caterpillars that cut young plants off at soil level overnight. A cardboard collar around each transplant, sunk an inch into the soil, stops them. Slugs eat young transplants too — check at night with a torch for the first week. The cutworms control guide and the vegetables pest control guide cover both. Once transplants show new growth, they have settled in — feed them according to the vegetables fertilizing guide and carry on as normal.
Common transplanting mistakes
- Transplanting carrots, beans, peas or sweet corn, which should always be direct sown.
- Skipping hardening off, so transplants scorch or die in their first days outside.
- Planting tender vegetables out before the last frost, or into cold soil.
- Planting tomatoes shallow instead of deep, wasting the chance to grow extra roots.
- Burying lettuce crowns or cabbage growing points, causing rot.
- Handling seedlings by the stem, which bruises easily.
- Planting in the heat of the day instead of on a cloudy day or in the evening.
- Letting transplants dry out in the first week, when their roots are still shallow.
- Feeding transplants before they show new growth, which can scorch young roots.
- Never using collars, so cutworms fell the transplants overnight.
Most transplanting mistakes happen in the first week, and they are all avoidable. Harden off, plant at the right depth, water well, mulch, and protect from cutworms. That is the whole method, and it works.
Frequently asked questions
How deep should I plant tomatoes?
Deep — bury the stem up to the first set of leaves. Roots form all along the buried stem, giving you a stronger plant. No other common vegetable benefits from deep planting this way.
What is hardening off and why does it matter?
Gradually getting indoor seedlings used to outdoor wind, sun and cold over 7–10 days. Skipping it is the most common reason transplants fail — soft indoor leaves scorch and wilt outdoors.
Can I transplant carrots?
No — carrots should always be direct sown. Transplanted carrot roots fork and grow misshapen. Sow them where they are to grow and thin to 2–3 inches apart.
When can I plant tomatoes outside?
After the last frost, when the soil has warmed up. A tomato planted into cold soil sulks for weeks — check your local extension service for your area's last frost date.
Why are my transplants wilting?
Usually transplant shock, which passes in a few days if the soil is kept moist. If wilting persists after a week, check for cutworms at the base, or for soil that is too wet or too dry.
Related guides
For more vegetable help, browse the guides hub and the growing guides hub, and try the seed starting calculator and the plant spacing calculator. Good next reads are the vegetables seed starting guide, the vegetables watering guide, and the growing guide for tomatoes. And as always, check your local extension service — local advice beats any general guide for your soil, your weather and your varieties.