How to Grow Green Chilli at Home: Temperature, Pots and Care

A single healthy chilli plant can give you fresh hari mirch for months. It grows well in a pot, needs little space and is one of the best plants for a balcony.

Indian cooking without green chilli is hard to imagine. A slit chilli in tempering, chopped chilli in poha, chilli in chutney, a raw one on the side with dal-chawal: small things that a home chilli plant makes easy and always fresh.

Chillies love warmth. This guide covers the temperatures they need, what happens when it is too hot or too cold, and how to look after the plant so it keeps flowering and fruiting.

Chillies come from the Americas, and people in Mexico and Central America were already growing them thousands of years ago. After Columbus they spread around the world very quickly, and Portuguese traders brought them to India in the 1500s, where they largely replaced black pepper as the main source of heat in many dishes. Today India is one of the largest producers and consumers of chillies in the world, with states like Andhra Pradesh, Telangana and Karnataka famous for them, and Guntur chillies are known far beyond India. China, Mexico, Thailand, Indonesia, Peru and Ethiopia are also major chilli countries, each with its own favourites, from Mexican jalapeño to Thai bird’s eye and Korean gochugaru.

Chillies love warm weather and long sunny days. In India they are grown in the monsoon and winter seasons in different regions, and in cooler countries they are a summer crop that has to be started early indoors. Hot, humid weather suits them, but extreme heat above about 90-95°F (32-35°C) makes flowers drop. If you live somewhere with short summers, choose early varieties and give the plants the warmest spot you have.

At a glance

Best temperature: 70-85°F (21-29°C)
Germination: 7-14 days at 80-85°F (27-29°C), slow below 70°F (21°C)
Sunlight: 6-8 hours of direct sun
Pot: 10-12 inch (25-30 cm) wide and deep at minimum, 5 gallon (19 L) is better
First harvest: roughly 60-90 days after transplanting

Benefits of green chilli

Green chillies are richer in vitamin C than many people realise, and they also contain vitamin A, vitamin B6 and small amounts of minerals. The heat comes from capsaicin, a compound that scientists study for its effects on metabolism and pain, but chillies are eaten in small amounts, so think of them mainly as flavour and a handy dose of vitamin C. Fresh green chillies also add punch to food without needing much salt or oil.

A single chilli plant is productive and compact. A healthy one can give dozens of chillies over a season, and the more you pick, the more it flowers, so a couple of pots on the balcony will cover most kitchens.

Best weather and temperature for chillies

Chillies are warm-weather plants, so temperature affects them at every stage, from the way seeds sprout to the way flowers turn into fruit.

Ideal: 70-85°F (21-29°C) with plenty of sun.
Seeds need warmth. They sprout best at 80-85°F (27-29°C). In cooler rooms they can take 3-4 weeks. Put the tray on top of the fridge, a warm shelf or a seedling mat.
Too hot: above about 90-95°F (32-35°C), flowers drop and fruit doesn’t set. Give afternoon shade and water well.
Too cold: growth slows below 60°F (16°C), and flowers fall off when nights are cold. Frost kills the plant.

When to sow chillies

Cooler climates: start seeds indoors 8-10 weeks before the last frost. Move outside only after the last frost, when nights stay above about 55°F (13°C).
India (plains): the main sowing times are June to July, October to November and January to February, avoiding peak summer heat and winter cold.
Harden off seedlings for a week by putting them outside for a few hours a day before planting out.

How to grow green chilli in pots

Sow seeds 1/4 inch (0.6 cm) deep in a seed tray with light potting mix. Keep warm and moist.
When seedlings have 4-6 true leaves, move each to a 4 inch (10 cm) pot, then to the final pot.
Use a final pot of 10-12 inch (25-30 cm) wide and deep, or a 5 gallon (19 L) bucket or grow bag, with drainage holes.
Use potting mix with compost. Add a stake once the plant gets tall.
Pinching off the first few flowers when the plant is small can give a bigger, stronger plant.

Caring for chilli plants

Unlike tomatoes, chillies do best when they are not pampered too much. Steady sun and slightly dry soil make a happy plant.

Light: 6-8 hours of direct sun. Indoors use a grow light.
Water: when the top 1 inch (2.5 cm) of soil is dry. Chillies prefer to be a little on the dry side, not soggy.
Feeding: use a balanced plant food or compost at the start. When flowers appear, switch to one lower in nitrogen and higher in potassium. Too much nitrogen gives lots of leaves and few chillies.
Mulch: a layer of dry leaves keeps soil moisture steady.
Warmth: in cooler weather move pots against a sunny wall.

Harvesting chillies

Pick green chillies when they are firm and full size for the variety, often 3-5 inches (7-12 cm).
Use scissors or snap them off carefully so you don’t tear branches.
Regular picking encourages more flowers and fruit.
Wash your hands after handling hot chillies and avoid touching your eyes.

Common problems

Flowers dropping: heat, cold nights, or irregular watering.
Curling leaves: often thrips, mites or aphids. Spray with water and neem oil.
Yellow leaves: too much water or lack of feed.
Plant is leafy but gives no chillies: too much nitrogen or too little sun.
Chillies are milder than expected: heat depends on the variety, how ripe the chilli is and growing conditions. Warm sun and slightly dry soil tend to make chillies hotter.

Frequently asked questions

How long does a chilli plant take to fruit?

About 60-90 days after transplanting, so 3-4 months from seed in warm weather.

Can I grow chillies indoors?

Yes, in a very sunny window or under a grow light. They need warmth and 6-8 hours of light.

Do chilli plants come back every year?

In warm climates they live for years. In cold places, cut back and bring the pot inside before frost.

Read our guide to the best temperature for tomatoes, how to protect plants from frost and the kitchen garden guide for beginners.