Peppers need a long, warm UK season: sow indoors in February or March at 18–21°C, pot on as they grow, and move plants to a greenhouse or sheltered sunny spot after the last frost in late May. Harvest fruits green or fully coloured from July to October.
A quick SoilCommander video on growing peppers at home in UK conditions — sowing, spacing, care and harvest in under a minute.
Not sure when to sow? See our When to Plant Peppers UK →
Sowing dates and growing advice verified against RHS guidance by the SoilCommander Growing Team.
Part of the UK Vegetable Growing Guides — how-to-grow guides for every crop.
| Task | Timing | Notes |
|---|---|---|
| Sow indoors | February – March | Heated propagator, 18–21°C; germination up to 21 days |
| Plant out | Late May – mid June | Only in warmest, sheltered southern spots outdoors — greenhouse elsewhere |
| Harvest | July – October | Pick green or fully coloured; pick regularly to keep plants fruiting |
When to Sow Peppers
- Indoor sowing: February–April in a heated propagator or warm windowsill
- Chillies: Sow in February — they need an even longer season
- Outdoor growing: Only in the warmest, most sheltered locations in the south
Recommended Varieties
- Mohawk F1 — early and reliable, good for shorter greenhouse seasons
- Gypsy F1 — very productive, sweet pointed fruits
- Apache (chilli) — compact, very productive, medium heat
- Jalapeno (chilli) — classic medium-heat, dependable cropper
Sweet peppers and chillies are the same species. The heat comes entirely from capsaicin levels. Consistent watering actually makes chillies slightly milder.
Common Mistakes to Avoid
- Sowing without enough heat. Peppers need 18–21°C to germinate reliably — cooler conditions simply delay growth, sometimes for weeks.
- Letting plants dry out at flowering. Flower buds can drop if plants get too dry, but overwatering in containers causes its own problems — aim for even moisture.
- Growing in pots under 30cm wide. Cramped roots restrict growth and cut yields — give peppers a generous container from the start.
- Skipping greenhouse humidity. Peppers need high humidity to fruit well — damping down the greenhouse floor helps set fruit that dry air would otherwise prevent.
Frequently Asked Questions
Can I grow peppers outdoors in the UK?
Only in very warm, sheltered spots with reliable overnight temperatures above 15°C — most UK growers get far better, more reliable results in a greenhouse.
How long do peppers take to crop from sowing?
Around 20–30 weeks from sowing to first harvest — greenhouse plants start fruiting by mid-summer, outdoor plants typically from August.
Do all pepper varieties suit UK growing conditions?
No — compact varieties like 'Redskin' suit containers and shorter seasons, while larger varieties need greenhouse space and a longer growing season to crop well.
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Last updated 4 July 2026
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