How to Tell When Melons, Squash and Gourds Are Ready to Pick

One family, four different tests

The single biggest cause of disappointing cucurbit harvests is applying the wrong test. Thumping works reasonably on a watermelon and tells you almost nothing about a muskmelon. Waiting for a slip works beautifully on a muskmelon and will never happen on a honeydew or a squash. Picking a summer squash by size is right; picking a winter squash by size is completely wrong.

Sort the family into four groups and apply the matching test. Immature-fruited types like cucumber and summer squash are picked young, at a size, and picked constantly. Sweet melons are picked fully ripe, using slip, aroma and skin change. Watermelons are picked on external signals because they give none of the melon ones. Hard-shell winter squash and gourds are picked on rind hardness and stem dryness, and in the case of drying gourds, months later than seems reasonable.

Day counts assume warm, bright growing weather. A cool, dull spell during fruit fill adds five to ten days to every figure in this table, so treat the numbers as the day to start checking rather than the day to pick.

Muskmelons: read the slip

A netted muskmelon tells you it is ready in a way nothing else in the garden does. As the fruit finishes, a corky crack forms right around the stem where it meets the shoulder, and the melon parts from the vine under its own weight or with the gentlest sideways push of a thumb. That separation is the slip, and it is more accurate than any other measurement available.

Confirm with two more signals. The background skin between the netting turns from green to a warm buff or gold, and the raised netting itself stands out rough and corky rather than lying flat. Then sniff the blossom end, the round scar opposite the stem, in the cool of the morning: a ripe fruit gives a clear sweet melon perfume from a couple of inches (5 cm) away. Smooth honeydew types never slip at all, so for those use the waxy skin feel, a blossom end that gives slightly under a thumb, and the day count.

Watermelons: three signs, all external

A watermelon gives you nothing from the stem, no aroma and no color change worth reading, so you work from three external signs and take a decision when at least two of them agree. Cut it once and it stops ripening entirely, so an early pick cannot be recovered.

The tendril test is the most reliable of the three. Find the curly tendril growing from the stem at the same joint as the fruit; when it has dried brown and shriveled all the way to the stem, the fruit is close. Second, roll the melon and look at the ground spot, the patch that rested on the soil: white or pale green means wait, a rich creamy or buttery yellow means ready. Third, the skin loses its gloss and goes dull and slightly rough, so a fingernail no longer slides freely across it. The hollow thump is real but the least reliable of the four, and no use at all to an inexperienced ear.

1. Check the tendril at the fruit's own joint Not the nearest tendril, the one at the same node as the fruit. Fully brown and crisp is the signal. Green or only half dry means several more days.
2. Roll it and look underneath Lift gently rather than turning it over hard. Buttery yellow means ripe; white means it has not finished, however impressive the size.
3. Run a nail across the skin A ripe watermelon has dull, slightly rough skin that resists the nail. A shiny, slick surface means the fruit is still filling.
4. Cut, never pull Take the stem with a knife or pruners, leaving two inches (5 cm) attached. Twisting a watermelon off tears the shoulder and rot enters within days.

Winter squash and hard-shell gourds

For anything you intend to store, ripeness is about the rind rather than the flesh. Press a thumbnail firmly into the skin between the ribs: on a ready fruit it leaves no mark at all. If the nail dents it, that fruit is not going to keep, whatever color it has reached. The stem should also have gone corky, brown and dry where it joins the vine, and the vine leaves are usually dying back by then.

Cut with two to four inches (5 to 10 cm) of stem attached and carry by the fruit, never the stem. A snapped stem is an open wound and it is where every storage rot begins. Then cure: ten to fourteen days somewhere warm at 80F to 85F (27C to 29C) and airy hardens the skin and heals small nicks, after which a cool dry room at 50F to 55F (10C to 13C) will hold a good squash for months. Hard-shell bottle gourds go far further, needing three to six months of dry, airy storage before the rind is hard and the seeds rattle inside, and they will grow harmless surface mold all through that time, which scrubs off at the end.

Get all storage fruit in before a hard frost. Frosted flesh, even where the skin looks fine, breaks down in storage within weeks, and one soft fruit will spoil everything stacked around it.

Picking little and often

Cucumbers and summer squash work on the opposite principle to everything else here. The plant's aim is mature seed, and a single fruit left to swell on the vine signals that the job is done and shuts down further flowering. Picking every day or two keeps that signal off and keeps the plant producing for weeks longer.

Cut rather than twist, use two hands so you do not lever the vine, and take every oversized fruit you find even if you plan to throw it on the compost. Leaving one giant zucchini on a plant costs you a fortnight of harvest, which is a far more expensive mistake than it looks.

The harvest notes that matter next year

Write the pollination date on a label beside each melon and winter squash the morning the female flower opens. From then on you are checking a prediction rather than guessing, and by the end of the season you own a set of day counts calibrated to your own garden rather than to a seed packet printed for somewhere else.

At harvest, record the picking date, the weight, the eating quality, and which type and position it came from. The pattern that emerges over two or three seasons is the useful thing: the fruit set in the first flush was small, the fruit set in the middle of the season was best, the last set never finished. That tells you exactly how many fruit to leave on each lateral, and when to stop letting new ones set at all.

1. Label every pollination A dated tag beside the plant, with the type and the position. This is the record that makes a melon or a squash harvest a decision rather than a gamble.
2. Record picking date and weight Weight against day count reveals whether your fruit is finishing or merely running out of season, which is the key question for deciding next year's start date.
3. Note the eating quality honestly One line per fruit: sweet, watery, bland, stringy. Tied to the day count, this is what tells you whether you are picking early or late, and it is worthless if written from memory in winter.
4. Log how long the stored fruit kept For winter squash and gourds, note the date each one was used or discarded. It tells you which types and which curing conditions are worth repeating.