Unlike cucumbers, which are generally finished by the end of August, courgettes commonly crop into October or until the first hard frost. That's good news for the harvest but awkward for planning a second crop — the later the bed frees up, the less has time to grow before the season ends.
On top of that, courgettes are among the hungriest vegetables there are. In a single summer they produce metres of foliage and dozens of fruits, so what the soil needs afterwards is replenishment rather than another demanding crop.
When courgettes finish and the bed comes free
Courgettes crop from July to October, until frost or powdery mildew — which almost always takes the leaves by late summer — stops them. So you needn't wait for the plants to finish on their own: once the fruits stop coming at a worthwhile rate, or the foliage yellows and turns mealy white, pull them out and free the bed. Don't compost mildewed foliage; the spores survive.
What to plant after courgettes — by when the bed frees up
By mid-September: radishes and rocket
The fastest options. Radishes are ready in 4–6 weeks, rocket sooner still. Both take cool nights and tolerate the first light ground frosts, so they're worth a go even with autumn closing in.
By early October: spinach and lamb's lettuce
Overwintering spinach varieties are sown exactly now — they simply slow through winter and can be picked in early spring. Lamb's lettuce is hardier still and one of the few vegetables you can harvest from under snow.
October: overwintering garlic
If the bed only comes free in October, the ideal choice is overwintering garlic — it's planted precisely then and costs you no spring or summer growing time at all. Improve the bed with compost first, though: garlic doesn't do well on soil exhausted by cucurbits.
When it's too late for anything: green manure
If courgettes hold the bed until the frosts, the best investment is green manure — white mustard or phacelia germinate even in cooler weather, frost off before winter, and their residue protects the soil through winter and enriches it in spring. Far cheaper and simpler than leaving the bed bare all winter.
Table: crops after courgettes and their timing
| Crop | When to sow/plant | Harvest |
|---|---|---|
| Radishes | by mid-September | in 4–6 weeks |
| Rocket | by mid-September | in 3–5 weeks |
| Spinach (overwintering) | by early October | early spring |
| Lamb's lettuce | by early October | autumn, through winter |
| Garlic (overwintering) | October | the following summer |
| Green manure | any time to mid-October | incorporate before winter or in spring |
What not to plant after courgettes
- Squash, cucumbers, melons — all cucurbits, sharing powdery mildew, aphid-borne viruses and flea beetles with courgettes. They shouldn't return to the same bed for 3–4 years.
- Any hungry crop without feeding — courgettes strip the soil mainly of potassium and phosphorus. Plan anything more demanding (tomatoes, peppers, brassicas) for this bed only after compost or manure has gone in.
How to prepare the bed after courgettes
- Remove the foliage and unripe fruits — if mildew got in, it belongs in the household waste, not the compost.
- Loosen the soil — courgettes leave a substantial root mass; once it's out, a light going-over with a fork pays off.
- Add compost before anything demanding — not needed for radishes or rocket, but yes for garlic and for anything next season.
- Don't leave the bed bare over winter — if nothing else, sow green manure or mulch it with fallen leaves.
Courgettes are the classic autumn reminder that not every bed manages a second crop — and that's fine. What else can still be done in the garden right now is set out in the guide to autumn garden jobs and the monthly overview of what to plant in September.
Frequently asked questions
What can I plant after courgettes in autumn?
It depends when the bed comes free. Up to mid-September you can still manage radishes or rocket; up to October, spinach and lamb's lettuce. If the bed only clears with the first frost, the best option is green manure or preparing it for overwintering garlic.
Can I plant squash or cucumbers after courgettes?
It isn't advisable. Courgettes, squash, cucumbers and melons are all cucurbits and share the same diseases — chiefly powdery mildew and aphid-borne viruses — as well as pests such as flea beetles. They should not return to the same bed for 3–4 years.
Is it true that courgettes exhaust the soil?
Yes. Courgettes are among the hungriest crops there are — over a season they produce an enormous quantity of leaves and fruit and draw mainly potassium and phosphorus out of the soil. The bed usually needs compost or well-rotted manure before you plant anything into it again next year.