
Capsicum annuum
Chilli peppers are tender perennials grown as annuals in the UK, requiring a long, warm season. They thrive in a greenhouse or a sunny, sheltered outdoor spot, producing fruits that range from mild to intensely hot depending on variety and growing conditions.
Step-by-step instructions for growing Chilli Pepper
Change the guide to see different planting timelines and tips.
Grow chillies in pots on a warm, sheltered patio or balcony, but be prepared to protect them from cold snaps.
Sow seeds in a heated propagator at from 19th January - 3rd February. Use seed compost and cover to a depth of .. Keep moist and expect germination in 7-14 days.
Once seedlings have two true leaves, prick them out into small pots from 9th February - 16th February. Handle carefully by the leaves to avoid stem damage and plant at the same depth as before.
Pot on into larger pots from 23rd February - 2nd March when roots fill the container. When plants reach tall, pinch out the growing tip to encourage a bushy shape. Pinch off the first flower bud to boost plant growth.
Gradually acclimatise plants to outdoor conditions over 10-14 days from 11th April - 25th April. Start with a few hours in a sheltered spot and increase exposure daily, bringing them indoors at night if frost is forecast.
Move plants into final large pots on a sunny, sheltered patio from 25th April - 9th May, spacing them apart. Use fleece or cloches for protection during cold spells.
Water regularly from 7th November, letting the compost dry out slightly between waterings to increase chilli heat. Once flowers appear, feed every 14 days with a high-potash tomato fertiliser until 16th May.
Harvest from 7th November by cutting fruits with scissors. Pick green for milder heat or leave to ripen fully to red, yellow, or other colours for maximum heat and sweetness. Continue harvesting until 11th July when frost threatens.
Plants that grow well (or poorly) with Chilli Pepper
Companion planting can help deter pests, improve pollination, enhance growth, and maximize garden space. Some plants release chemicals that repel pests or attract beneficial insects, while others can improve soil quality or provide shade for sensitive plants.
Popular varieties of Chilli Pepper to consider
A compact variety ideal for pots, producing small, hot red fruits that mature early in the UK season.
A classic long, thin chilli with medium heat, perfect for drying and using in sauces.
A popular medium-hot chilli with thick walls, great for fresh eating or pickling.