How To Grow & Plant Peppers | Premier Polytunnels

Introduction

Few crops come in the variety of shapes, sizes and colours as peppers. From sweet bell peppers to fiery chilli peppers, they're even tastier when you grow them yourself.

Before you start growing your own, we've written this guide to help you. Whether you're a seasoned gardener or just starting, you'll find everything you need to know below.

Best conditions to grow peppers

Peppers need plenty of sunshine and warmth to flourish. In the UK's cooler climate, they grow best in milder regions or during long, hot summers, so it's best to grow them under cover.

If you don't have a conservatory or greenhouse, consider investing in a polytunnel. They create a warm environment with plenty of light and come in various sizes to suit your space and budget.

When to grow peppers

Sowing: February to April
Planting: May to June
Harvesting: July to October

How to grow peppers from seeds

Sow pepper seeds in late winter or early spring, around two months before the last frost date. Sow seeds in pots or plug trays, spacing them 2cm apart. Water lightly with a fine spray.

Place the pots on a warm windowsill (18–21°C) to germinate. Alternatively, use a propagator or cover with clear plastic bags secured with rubber bands. Once seedlings appear, remove coverings and maintain bright light at 16–18°C, watering regularly.

Move seedlings into individual pots when the first true leaves appear. Keep temperatures high to encourage growth. Handle plants carefully to protect their delicate stems.

How to plant peppers

Keep young pepper plants indoors until ready to plant out. In a heated polytunnel or greenhouse, plant out in late April; in an unheated covered space, mid-May; outdoors, late May.

How to grow peppers in pots

Use pots at least 30cm wide (6 litres). Fill with high-quality potting soil enriched with compost. Place pots in a polytunnel to protect them.

How to grow peppers in the ground

Acclimatise peppers by gradually leaving them outdoors for increasing periods. Plant after the last frost date in well-draining soil enriched with organic matter. Warm soil with cloches for a couple of weeks before planting.

Plant peppers at least 40cm apart and cover with cloches to protect from wind.

Caring for pepper plants

Peppers require minimal attention but these steps will help them thrive:

Support: Insert a cane or stake next to the main stem and tie with twine. Larger plants may need multiple canes.
Pruning: Pinch out the tops of main stems at 20cm tall to encourage bushier growth.
Watering: Water little and often; in pots, use trays to allow water absorption through drainage holes.
Feeding: Apply a high-potash liquid fertiliser weekly once the first flowers appear.

How long do peppers take to grow?

Peppers take 60–90 days from seed depending on variety. Starter plants can shorten the time. Pick peppers green or wait until they reach full colour; they become sweeter as they ripen.

Harvesting peppers

Cut peppers off at the stalk with a sharp knife or pruning scissors. Eat fresh, or store in the fridge for several days. Excess peppers can be pickled, made into sauces or soups, or frozen for later use.