How to Grow Karela (Bitter Gourd) at Home

Karela (bitter gourd) is a warm-weather vine that gives a heavy harvest from just a few plants. It grows well in India, loves heat and humidity, and can also be grown in a big pot with a trellis in cooler countries.

Karela divides families. Some people love its sharp, bitter flavour and others run from it, but nearly everyone agrees that karela from a vine you grew yourself tastes better than the shop-bought kind, and you get to pick it young, when it is at its best.

Bitter gourd (Momordica charantia) is thought to have originated in tropical Asia, and India is one of the main growing countries. It is a favourite in India, Pakistan, Bangladesh (where it is called korola) and Sri Lanka (karawila), and also in China, where it is known as kugua, and in Vietnam, where stuffed bitter melon soup is a classic. In Okinawa in Japan, goya champuru is a famous summer dish, and in the Philippines ampalaya is cooked with eggs or in the vegetable stew pinakbet. It is also eaten in Thailand, Indonesia, parts of Africa, the Caribbean and Brazil.

This is a plant of hot, humid weather. In India it is grown as a summer crop, sown in February and March, and as a rainy-season crop, sown in June and July, and it is harvested through the hottest months. In Okinawa and southern China it is a summer vegetable. In cooler countries gardeners start the seeds indoors and plant the vines out only after the weather has warmed up, because a cold snap can stop growth. Where the summer is short, a sunny wall or a greenhouse can help.

Karela is a tropical plant, so the key things are warmth, a sturdy support and regular picking. Here is the temperature it needs and how to grow it step by step.

At a glance

Best temperature: 75-95°F (24-35°C)
Germination: 7-14 days at 75-90°F (24-32°C)
Growth slows below 65°F (18°C). Frost kills the plant
Sunlight: 6-8 hours of direct sun
Pot: 5-10 gallon (20-40 L) or bigger, with a trellis 5-6 feet (1.5-2 m) tall
First harvest: about 55-75 days after sowing

Benefits of karela (bitter gourd)

Bitter gourd is low in calories and a good source of vitamin C, folate, vitamin K and fibre, along with some potassium and iron. In India, China and many other Asian countries it has been used as both food and traditional medicine for a very long time, and it is especially well known for blood sugar. Some studies suggest it may have a small effect, but the evidence is limited and it is not a replacement for medicine, so please talk to your doctor if you have diabetes or take medication before using karela or karela juice regularly.

The bitterness comes from natural compounds in the fruit. Salting and squeezing the slices, cooking well, and pairing karela with spices, tomato or a little sweet and sour flavour all tame it. Smaller, lighter green fruits are generally less bitter than big dark ones, and picking young is one of the real benefits of growing your own.

Best weather and temperature for karela

Ideal: 75-95°F (24-35°C) with plenty of sun. Karela handles heat and humidity well.
Cold: growth slows below 65°F (18°C), and seedlings may stall or rot in cold, wet soil. Frost kills the plant.
Plant out only when nights stay above about 60°F (16°C) and the soil is warm, around 65-70°F (18-21°C).
Very hot, dry spells can make flowers fall, so keep the soil moist.

When to sow karela

India (plains): February to March for the summer crop and June to July for the rainy season crop.
Cooler climates: start seeds indoors 3-4 weeks before the last frost, in individual pots, and plant out after the frost has passed and the weather is warm.

How to grow karela in pots

Karela is a climber, and the vine does the work as long as you give it something to climb. Plan the support before you plant the seeds.

Karela seeds have a hard coat. Soak them in water for 12-24 hours, and gently nick or rub the edge of each seed to help it sprout.
Sow 1/2-1 inch (1.2-2.5 cm) deep, 2-3 seeds per pot. Keep the soil warm and moist. Seeds can take 1-2 weeks to come up.
Use a pot of at least 5-10 gallon (20-40 L), about 15-18 inch (38-45 cm) wide and deep, with drainage holes. Fill with potting mix with compost.
Thin to the strongest plant.
Put a trellis, net or strings in place at planting. The vines climb 6-10 feet (2-3 m), so use a support at least 5-6 feet (1.5-2 m) tall.
In cool areas, use a sunny spot and a dark pot to warm the soil, and avoid disturbing the roots when transplanting.

Caring for karela

Light: 6-8 hours of direct sun.
Water: keep soil evenly moist, about 1-2 inches (2.5-5 cm) per week, more in heat. Water at the base, not on the leaves.
Feeding: mix compost into the soil and feed every 2-3 weeks with a balanced plant food. Switch to one higher in potassium once flowers appear.
Mulch: dry leaves or straw keep soil moisture even.
Train the vine up the support and tie it loosely. Pinch the main tip when it reaches the top to encourage side shoots.

Flowers and pollination

Many first-time growers see plenty of yellow flowers but no fruit and wonder what went wrong. The reason is that karela makes two kinds of flowers.

Karela has separate male and female flowers. Male flowers come first. Female flowers have a tiny baby fruit behind the petals.
Bees do the work. If you see flowers but no fruit, pollinate by hand in the morning. Use a small brush or take a male flower and touch its pollen to the centre of a female flower.

Harvesting karela

Once the fruit starts to form it grows surprisingly fast, so check the vine every day or two.

First fruits come about 55-75 days after sowing.
Pick when the fruit is green, firm and has formed its bumps, before it starts turning yellow or orange.
Harvest every 2-3 days with scissors or a knife, leaving a short piece of stem. Frequent picking keeps the plant producing.
Fruits left on the vine to ripen turn orange and split open, and the plant slows down.

Common problems

Powdery mildew and downy mildew: white or yellow patches on leaves in humid weather. Give space, water the soil and remove affected leaves.
Fruit fly: maggots in the fruit. Cover young fruits with paper or net bags.
Aphids and red pumpkin beetle: remove by hand, spray with water or neem oil.
Flowers falling off: heat stress, cold or no pollination.
Yellow leaves: too much water or lack of feed.

Frequently asked questions

How long does karela take to grow?

About 2 months from sowing to the first fruit in warm weather.

Can I grow karela in a pot?

Yes. Use a pot of at least 5-10 gallon (20-40 L) with a tall trellis.

Does karela need a lot of water?

It needs regular water, but not soggy soil. Keep the soil evenly moist, especially in heat.

Cook your harvest in our easy karela sabji without onion. Also read our kitchen garden guide for beginners, how to grow green chilli and how to compost kitchen scraps for your pots.