When Is a Pomelo Ripe? Picking, Thinning and Storing the Crop

Green does not mean unripe

The single most common mistake with a pomelo is waiting for it to turn yellow. Citrus rind loses its green only when night temperatures drop, and the color change has nothing whatever to do with the sugar inside the fruit. In a warm region a pomelo can reach full ripeness, full sweetness and full size while remaining a solid pale green, and a grower waiting for color will leave it on the tree until it has gone dry and pithy inside.

The reverse trap exists too. In a cooler autumn the rind may take on a good yellow blush weeks or months before the flesh is ready, because the cold nights did their work on the skin while the fruit was still building sugar. Color is a report on your night temperatures, not on the fruit.

So use other signals. A ripe pomelo feels heavy for its size, which is the most reliable single test: lift two fruit of the same diameter and the ripe one is noticeably the heavier. The rind loses its hard glossy tension and gives very slightly under a thumb without being soft. Tapped with a knuckle it sounds dull and solid rather than hollow. And the fruit will have been on the tree a long time, which is the signal people most often underestimate.

It takes far longer on the tree than you expect

A pomelo needs something in the region of six to nine months from flower to a fruit worth eating, and in a cooler climate it can be longer still. That is materially more than an orange and it is the fact that most new growers get wrong. The fruit reaches something close to its final size months before it reaches its final sweetness, and everything after that point is sugar being built by sunlight.

Picking early is therefore an expensive mistake. Citrus does not ripen after picking; there is no starch reserve to convert, as there is in a banana or a pear. A pomelo taken off the tree in the month before it was ready will be sour and dry and will simply stay sour and dry on the counter. Once you cut it, that is the fruit you have.

The good news is that a pomelo holds well on the tree once it is ready. You can leave the crop hanging for several weeks after it reaches eating quality and pick as you want it, which is far better than picking everything at once and storing it. Do not push this indefinitely, though: hold it too long and the flesh dries out, the pith takes over and the fruit goes coarse. And in a marginal climate, fruit left hanging into a cold snap will be frost damaged.

The only test that settles the argument is cutting one open. Pick a single representative fruit, cut it, and taste it. If it is not ready, you have lost one fruit and gained certainty about the other twenty. Do this before every harvest rather than trusting last year's timing.

Write down the week the tree flowered and the week you finally picked good fruit, every year. After two seasons you have your own interval for your own tree and site, which is worth more than any general figure, and it turns the whole ripeness question into a date to start testing from.

Thin early, prop late

Fruit weight is a structural problem on this tree, not just a horticultural one. Once the second natural drop has finished and the remaining fruitlets are somewhere around golf-ball size, go over the tree and thin deliberately. Remove any fruit touching another, any fruit hanging at the very end of a long thin branch, and enough of the rest that no branch carries more than it can plainly hold.

Spacing the fruit widely also gives every one of them room to reach full size and light to sweeten in, so thinning is not purely defensive. On a young tree, be severe: two or three fruit on a three-year-old, half a dozen on a four-year-old. A young pomelo allowed to carry a full crop puts its energy into fruit instead of framework and stays small and weak-crotched for years afterwards.

Later in the season, when the remaining fruit is swelling hard, walk the tree and sight along each loaded branch from the side. A tip that has dropped noticeably needs either a padded prop set two-thirds of the way out along the branch, or fruit removed from it. Do this before a storm rather than after one.

1. Wait out the natural drop Do nothing until the second wave of fruit drop has finished, several weeks after petal fall. Thinning before the tree has made its own decisions means you remove fruit it was going to keep and keep fruit it was going to shed.
2. Remove touching fruit first Any two fruit in contact will both develop a flat sunless patch and hold moisture between them where rot starts. Take the smaller or worse-placed one of each pair off with pruners rather than pulling.
3. Clear the branch tips Remove fruit hanging at the far end of long thin branches, where the leverage is greatest. Fruit set closer to a strong limb is fruit the tree can actually hold up for the eight months it needs.
4. Set the final load by the tree's age Two or three fruit on a three-year-old, a handful on a four-year-old, and on a mature tree as many as the framework can support with no branch bending. When in doubt, take one more off.
5. Prop what remains loaded Set a padded Y-topped post under any branch whose tip has dropped, standing on a slab so it does not sink into wet ground. Check the props after every storm and re-seat any that have shifted.

Cutting, handling and storing

Cut a pomelo off with pruners or a picking shear, leaving a short stub of stalk. Never pull or twist it. The fruit is heavy enough that pulling tears the rind at the stem end, and that torn spot is the entry point for the rot that will spoil the fruit within days. Hold the fruit with one hand and cut with the other; the weight is genuinely awkward one-handed.

Handle the picked fruit as if it bruises easily, because it does, and the damage does not show on the outside until later. Set them down rather than dropping them into a bucket, and do not stack them more than two deep. A rind puncture from a thorn or a branch stub is worth cutting out at once by eating that fruit first.

A sound pomelo stores well: several weeks at cool room temperature, and a month or two in a cool place around 50F (10C) with some air movement. It keeps better than most citrus because the thick pith acts as insulation. Do not seal them in a bag, which traps moisture against the rind and starts rot at any small blemish.

One expectation to set before you cut the first one: the thick rind and the deep white pith mean the edible flesh is a good deal smaller than the fruit looks from the outside. A fruit the size of a football yields something closer to a large grapefruit in segments. That is normal and not a sign of anything wrong. Score the rind from top to bottom in four or five places, peel the thick layers back, then take each segment out of its own membrane, which lifts away far more easily than a grapefruit's.