How to Grow Snake gourd

Trichosanthes cucumerina · Also called: Serpent gourd, Chichinda, Padwal, Pudalangai, Potlakaya, Padavalanga, Chichinga, Viper gourd

A white snake gourd flower held in a hand, its five petals fraying into long tangled threads.

Photo: Aathavan jaffna, CC BY-SA 3.0 (Wikimedia Commons)

Snake gourd is a cheap, fast, generous vegetable that turns a few poles and some wire into food for months. It is sown straight into the ground, it climbs whatever it is given, it starts cropping in about two months and then gives fruit every two or three days. Across India, Sri Lanka, Bangladesh and Southeast Asia it is a staple of small plots and market gardens alike. It also has one property no other gourd in this library shares: the fruit can be a metre or more long, and it will only grow straight if it is allowed to hang freely. That is why this crop is not really optional about trellising. A snake gourd grown on the ground curls into a coil, spots where it touches the soil, and is worth a fraction of a straight one.

Growing Snake gourd, Stage by Stage

1. Get the land ready and build the frame — The frame matters more here than anywhere else in this library.
2. Soak and sow the seed — A hard seed that needs a night in water and warm soil.
3. Weed, water and feed — Steady moisture while the fruit is filling, and a light hand once flowering starts.
4. Flowering and fruit set — White fringed flowers that open at dusk and are worked by moths.
5. Watch for trouble — The fruit fly again, working from inside the young fruit.
6. Harvest young and green — Two weeks after the flower, while a thumbnail still marks it.
7. Keep it fresh, and keep the seed — It is long, fragile and full of water. Handle it once and sell it fast.

Common Problems & Troubleshooting

If you see: Fruit that has grown into a coil or a tight bend instead of hanging straight.

It likely means: It had nothing to hang freely from. This fruit only grows straight under its own weight, so a vine on the ground or on a low frame coils every fruit it makes.

Do this: Build an overhead frame about two metres high before sowing, not after the vine starts running.

If you see: Young fruit with small puncture marks, going soft and rotten with maggots inside.

It likely means: Fruit fly. The female lays her eggs under the skin of a young fruit and the grubs develop inside, out of reach of anything sprayed on the surface.

Do this: Pick and destroy every affected fruit rather than dropping it beneath the frame.

If you see: A strong leafy vine covered in flowers that sets almost no fruit.

It likely means: Often the first flowers are all male, which is normal. But if female flowers are opening and dropping, the moths that pollinate this crop are not doing their work.

Do this: Wait, since the first flush of flowers on this plant is male and the females come later.

If you see: Fruit turning orange or red on the vine.

It likely means: It was left too long. This gourd is eaten green, and a ripening fruit is finished as a vegetable however good it looks.

Do this: Go over the whole frame every two or three days without exception.

If you see: Long fruit snapped or kinked by the time it reaches the market.

It likely means: It was bent to fit a crate, stacked under other produce, or carried carelessly. A metre-long fruit full of water breaks easily.

Do this: Cut with a short stalk and carry the fruit supported along its length.

If you see: Fruit that is bitter, short and misshapen.

It likely means: Usually water stress. A vine that dries out while carrying fruit makes small bitter fruit. It can also mean seed of the short wild form rather than the cultivated one.

Do this: Water regularly and never let the plants dry out while they are fruiting.

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 snake gourd 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.

Build the frame first. Two metres, strong, walk under it.
The fruit only grows straight if it hangs free.
Soak the seed overnight. The coat is hard.
The first flowers are male. They drop. That is normal.
The flowers open at dusk. Moths do the work.
Never spray in the evening. You would kill your pollinators.
Tie a stone to a fruit that starts to curl.
Pick at two weeks, green, while a thumbnail marks it.
Orange means finished. Pick it off anyway.
Lay it out straight. Bending it after picking breaks it.

Test Yourself: Identification

What does the flower look like?

What does the crop look like growing?

When is the fruit ready to pick?

Honest Limits of This Guide

Timings here are given by season and by the state of the plant rather than in named months, because snake gourd is grown year-round in the tropics and in the warm season elsewhere. Count from your own sowing.
This guide covers the long cultivated snake gourd, usually written as var. anguina. The short bitter wild form of the same species is a weed and is not the crop.
The photographs show garden and small-plot crops under home-built frames rather than a large commercial planting, because usable pictures of that are not available under a licence this library can use. The frame, the vine and the fruit are the same at any scale.
The practice of tying a small weight to a curling fruit is a real and widely used local technique. How much weight and when is a matter of local judgement rather than a rule.
Variety advice is deliberately local. Types differ greatly in fruit length, from under a foot to well over a metre, and which your market wants is a question for that market.
The fruit fly advice is cultural — sanitation, bagging and prompt picking — because that is what a smallholder can do everywhere and because the grub sits inside the fruit. Traps exist and are worth asking a local dealer about.
No chemical treatments are named here. The fruit is eaten with its skin, the crop is pollinated by moths that fly in the evening, and what is permitted differs by country and by buyer.

Sources

GBIF Backbone Taxonomy species-match record for Trichosanthes cucumerina L. — Global Biodiversity Information Facility (GBIF), Copenhagen (source)
EPPO Global Database — Trichosanthes cucumerina (EPPO code TTHCU) — European and Mediterranean Plant Protection Organization (EPPO), Paris (source)
Trichosanthes cucumerina and cucurbit fruit flies — CABI Compendium datasheets — CABI, Wallingford (source)
Indian Council of Agricultural Research and State Agricultural University extension guidance on cucurbit vegetable cultivation — Indian Council of Agricultural Research (ICAR), New Delhi (source)
FAO guidance on post-harvest handling of perishable vegetables — Food and Agriculture Organization of the United Nations (FAO), Rome (source)

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