When to Harvest Winter Melon and How to Store It for Months

Ripe means the skin has changed, not the size

Winter melon reaches full size several weeks before it is ready to cut, and this catches out almost everyone growing it for the first time. A fruit that has stopped swelling still has to finish its skin, and the skin is the entire reason for growing the crop, because a properly finished winter melon keeps for six months or more in an ordinary cool room without any processing at all.

The change to watch is the surface. As the fruit matures, the fine bristly hairs that cover a young fruit wear away, the green deepens or dulls, and a chalky white bloom develops over the skin. That bloom is a natural wax the fruit lays down, and it is what stops moisture escaping in storage. A fruit picked before the bloom has formed properly will shrivel within weeks no matter how well you store it.

Never test ripeness by rubbing a patch of skin to see the color underneath. That removes the bloom in exactly the place you have handled, and that spot becomes the first part of the fruit to fail in storage.

Cutting it without ruining it

Almost every storage failure begins at the moment of harvest, and almost all of them are caused by two mistakes: cutting the stalk too short, and picking the fruit up by the stalk. Both are avoidable and neither is forgiving.

The stalk is a seal. Cut flush against the fruit and you leave an open wound at the shoulder, which is the wettest, softest part of the fruit and precisely where rot organisms want to be. Leave a length of stalk attached and that wound is inches away from the flesh, drying and corking over in its own time.

1. Leave two to three inches of stalk Cut the vine either side of the fruit with pruners or a sharp knife, leaving two to three inches (5 to 8 cm) of stalk attached. Cut cleanly rather than crushing, so the cut surface can seal.
2. Never lift it by the stalk The stalk looks like a handle and is not one. It snaps out under a twenty pound (9 kg) load and takes a plug of flesh with it, opening the fruit at the worst possible point. Support the fruit from underneath with both arms.
3. Pick on a dry day Cut in the afternoon of a dry day so the stalk begins sealing straight away. A wet stalk going into store is the commonest cause of shoulder rot.
4. Do not wipe or wash it Leave the soil and the bloom exactly as they are. Any cleaning removes wax, and a fruit you have wiped clean will keep for weeks instead of months.
5. Beat the first frost Frost on the fruit ends its storage life even though the flesh looks fine. Bring everything in before a hard frost is forecast, finished or not.

Curing, briefly

Winter melon needs far less curing than a pumpkin does, because its keeping quality comes from the wax bloom rather than from a rind hardened by heat. What it does need is a week somewhere warm, dry and airy so the cut stalk seals over and any surface moisture goes. A covered porch, a dry shed or a greenhouse bench all work.

Set the fruit on a slat or a pad of straw rather than a hard flat surface, and do not stack anything on it. Roll it as little as possible, and only on a soft surface.

Storing it, and how long you actually get

A cured winter melon wants a cool dry dark room with air moving around it. A spare bedroom, a dry cellar or an unheated hallway is right. A refrigerator is wrong, both because it is too cold and because it is too humid, and a fruit that has been chilled goes over quickly once it comes out.

Store it on a slatted shelf or a bed of straw, off the floor and not touching anything else. Check it every couple of weeks by looking rather than handling, and pay attention to the stalk end and to the patch that was in contact with the shelf, which are where trouble starts. Once cut, a winter melon behaves like any other vegetable: wrap the cut face and use it within a week or so.

Flavor is mild and does not improve or decline much in store, so there is no need to hurry a good fruit. The flesh does firm up over the first month, which many people prefer for cooking.

What to write down at harvest

Harvest is where a five-month crop either pays or does not, and the notes you take on the day are what fix your judgement for the following year. Keep them per fruit, since you will only have one or two.

1. The set date and the cutting date The gap between them is your own weeks-to-maturity on your own ground, which is worth far more than any figure on a packet.
2. Weight, and which plant it came from Record both. Over two seasons this settles the question of whether to let your plants carry one fruit or two.
3. The state of the bloom and stalk when cut Note how even the bloom was and whether the stalk had started to cork. Compare that against how long the fruit kept and the sign becomes reliable rather than guesswork.
4. The date the first stored fruit failed, and where Write down when a stored fruit goes over and which part failed first. Stalk end means you cut too short; underside means it sat wet in the field.