April is the garden’s most dynamic month: after March’s waiting game, work now starts in earnest. The soil warms up, seedlings can go outdoors, and frost-sensitive crops need their seeds started — but frost risk hasn’t fully passed yet.
What does an April garden look like?
By early April the soil is workable and frost-tolerant seedlings can be transplanted outdoors. By mid-to-late month, soil temperature may suit heat-loving plants too — but in many temperate climates the last frosts can occur as late as mid-May, so plant frost-sensitive crops outdoors only at the very end of the month, cautiously.
Continuing outdoor sowing and new crops
- 🥗 Radish, lettuce, beetroot: sow a new row every 2-3 weeks for a continuous harvest
- 🌿 Dill, coriander: fast-growing, easy to sow directly
- 🫘 Green beans: only at the end of the month, once night frosts have passed
April sowing overview
| Plant | Location | Note |
|---|---|---|
| Beans (green beans) | Outdoor sowing (end of month) | Frost-sensitive, wait until last frosts pass |
| Beetroot, radish, lettuce | Outdoor sowing (continued) | Sow a new row every 2-3 weeks for continuous harvest |
| Dill, coriander | Outdoor sowing | Fast-growing herbs |
| Onion sets | Outdoor planting | Now is the time if not done yet |
| Early potatoes | Outdoor planting | After last frosts, planted in ridges |
| Cabbage, broccoli seedlings | Transplant outdoors | Hardened seedlings can go out |
| Courgette, squash, melon | Indoor seedling | Start now for transplanting in May |
| Sweetcorn | Indoor start or late-April sowing | Heat-loving, can go outdoors after frost |
Transplanting and tuber/bulb crops
- 🧅 Onion sets: plant now if you haven’t already
- 🥔 Early potatoes: after the last frosts, planted in ridges
- 🥦 Cabbage, broccoli, kale seedlings: after hardening off, relatively frost-tolerant
What to watch for in April: late frost risk approaching
- ❄️ The late frost period (in many regions running into mid-May) is still ahead — only plant out heat-loving crops permanently after this window passes
- 🌱 Start heat-loving seeds indoors (courgette, squash, corn) so you have transplant-ready seedlings by May
- 💧 April wind dries soil quickly — watch watering, especially for new sowings
- 🐛 Check seedlings regularly for pests (slugs, aphids) while they’re still vulnerable
Plan your companion pairings too
While filling the beds, it’s worth thinking ahead about what goes next to what. Good companion planting isn’t just useful — it protects plants too.
Summary
April is the garden’s busiest month: outdoor sowing continues, more frost-tolerant seedlings can be transplanted, and tuber crops get going too. The biggest challenge is timing — only plant heat-loving crops outdoors permanently after the late-frost window passes.
❓ Frequently Asked Questions
Why are “hardened off” seedlings more frost-resistant than unhardened ones? A seedling gradually exposed to cold increases the concentration of osmotically active substances in its cells and thickens its cell walls, which lowers the freezing point and protects against damage from ice crystals — a suddenly transplanted, unhardened seedling can’t switch on this defense quickly, making it far more vulnerable to a cold night.
Why should early potatoes be planted in a raised ridge? A ridge rising above ground level warms up faster during the day than flat soil, allowing earlier sprouting — the raised soil also offers some protection against a late frost and prevents tubers near the surface from turning green in sunlight.
Why re-sow radishes, lettuce, and beets every 2-3 weeks? These plants hold their peak quality for a relatively short time — sowing everything at once would mean it all matures at once, and the surplus would go past its best before you could eat it; staggered sowing gives a continuous, manageable harvest throughout the season.
Why start warm-season seeds indoors in April when they’re only transplanted in May? These plants need a few weeks to develop roots and foliage strong enough for transplanting — waiting until frost risk passes to also sow the seed would mean the plant matures too late for the short summer season; indoor pre-growing gives the season a head start.