How to Grow Bitter gourd

Momordica charantia · Also called: Bitter melon, Karela, Pavakkai, Kakarakaya, Hagalakayi, Ampalaya, Ku gua, Momordica

A bitter gourd garden in Tamil Nadu with vines trained over an overhead framework and long green ridged fruits hanging down beneath the canopy of lobed leaves.

Photo: USHA A, CC BY-SA 4.0 (Wikimedia Commons)

Bitter gourd is one of the fastest-paying vegetables a smallholder can grow. It gives its first fruit about two months after sowing, it goes on producing for months if it is picked often, and it sells steadily because it is an everyday vegetable across South and South East Asia, China, the Caribbean and much of Africa. India, China, the Philippines, Bangladesh and Viet Nam grow the most. It needs a trellis and it needs watching for one particular pest, and in return it turns a small piece of ground into a regular weekly income rather than a single harvest.

Growing Bitter gourd, Stage by Stage

1. Get the land ready and build the trellis — Warm well-drained ground with a trellis standing before anything is sown.
2. Choose your seed and planting material — Buy fresh seed of a kind your market recognises, and soak it before sowing.
3. Sow and train — Sow into warm moist soil and guide the vine up the trellis by hand.
4. Water — Water steadily and evenly, because this vine fruits continuously and cannot be allowed to check.
5. Weeds and feeding — Feed it often and lightly, because a vine picked every two days is being asked to keep going.
6. Flowering and fruit set — The first flowers are male and they fall. That is normal, and the female ones follow.
7. Watch for trouble — Fruit fly is the one that matters, and it is beaten by covering the fruit rather than by spraying it.
8. Harvest — Pick young, green and firm, every two or three days, because a ripe bitter gourd is a lost one.
9. Keep, store and sell — It keeps only days, so sell fast, and grade it because buyers are fussy about shape.

Common Problems & Troubleshooting

If you see: Large numbers of yellow flowers opening and dropping off within a day, with no fruit forming behind them.

It likely means: Almost always the male flowers doing exactly what they should. This plant carries separate male and female flowers, the males come first and in far greater numbers, and they fall after a day.

Do this: Look behind the flower: a female has a tiny bitter gourd already formed there, a male has a plain stalk.

If you see: Small puncture marks on young fruit, which then yellows, softens and rots, with maggots inside when cut open.

It likely means: Fruit fly. It lays its eggs inside the fruit, so nothing applied to the outside reaches the grubs, and it is the main pest of this crop almost everywhere.

Do this: Cover each young fruit with a paper or plastic bag as soon as it is finger-length.

If you see: Fruit that is bent, twisted or flattened on one side, which buyers pay less for.

It likely means: It grew lying on the ground or pressed against a stem or another fruit instead of hanging free.

Do this: Train the vine onto a trellis so fruit hangs clear.

If you see: Fruit turning yellow and then orange on the vine, splitting open to show bright red seed coats inside.

It likely means: It was left too long. This vegetable is eaten unripe, and a ripe fruit is finished for sale however handsome it looks.

Do this: Pick eight to twelve days after set, while the fruit is firm and green with sharp ridges.

If you see: A huge leafy vine covering the whole trellis with plenty of male flowers and very few females or fruit.

It likely means: Too much nitrogen, or the vine was never tipped, or both.

Do this: Pinch out the growing tip when the vine reaches the top of the trellis, since side shoots carry the female flowers.

If you see: Leaves yellow-mottled, crumpled or distorted, with stunted growth and small misshapen fruit.

It likely means: A virus, usually carried by whitefly or aphids. It cannot be cured.

Do this: Pull out and destroy affected plants rather than hoping they recover.

If you see: A sowing where many seeds have simply sat in the ground without sprouting.

It likely means: The hard seed coat kept the water out.

Do this: Soak the seed overnight in clean water before sowing.

Yield & Market Value

Growing the crop is only part of the job. The last part is knowing what a normal harvest looks like where you are, and knowing what your fruit is worth before you agree a price with anybody.

Remember It This Way

If you forget every other page of this guide, keep these lines. They are the whole crop, in order, short enough to carry in your head.

Trellis first. Fruit that hangs free grows straight and clean.
Soak the seed overnight. The coat keeps water out.
Tip the vine at the top. Side shoots carry the female flowers.
The first flowers are male and they fall. Nothing is wrong.
A female flower has a tiny gourd behind it. A male has not.
No bees, no fruit. Never spray while it is flowering.
Bag each young fruit at finger length. That beats the fly.
Pick every two or three days, firm and green.
Picking keeps it flowering. Letting fruit ripen stops it.
Collect every fallen fruit. Each one breeds more flies.

Test Yourself: Identification

Why is the whole crop grown up a trellis?

When is the fruit on its stem ready to pick?

A fruit has turned orange and burst open. What happened?

Honest Limits of This Guide

Timings are given in days from sowing and from fruit set rather than in named months, because bitter gourd is a warm-season crop grown in both hemispheres and nearly all year in the tropics. Count from your own sowing date.
Which shape, length and colour sells well differs sharply between markets even a short distance apart, and this guide cannot tell you which kind your buyers want. Ask them before choosing seed, because it cannot be changed once the crop is in.
Bitter gourd is grown overwhelmingly on small plots for nearby markets, so published yield figures capture only part of the crop and should be treated as a rough idea of scale.
This plant has a long history of traditional medicinal use, particularly around blood sugar. This is a farming guide and makes no health claims either way, and anyone taking medicine for diabetes should talk to a doctor before eating large or unusual amounts of it.
This guide names no chemical treatments. Fruit fly lays inside the fruit where surface applications cannot reach the grubs, fruit is picked every two or three days, and the answers that work are bagging the young fruit, collecting every fallen fruit, and never spraying during flowering.

Sources

GBIF Backbone Taxonomy species-match record for Momordica charantia L. — Global Biodiversity Information Facility (GBIF), Copenhagen (source)
EPPO Global Database — Momordica charantia (EPPO code MOMCH) — European and Mediterranean Plant Protection Organization (EPPO), Paris (source)
FAOSTAT crops and livestock products, and FAO and World Vegetable Center work on cucurbit vegetables — Food and Agriculture Organization of the United Nations (FAO), Rome (source)
Momordica charantia (bitter gourd) — CABI Compendium datasheet — CABI, Wallingford (source)

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