Gadenin日本語Get the appPrune immediately after harvest and at no other time
The timing rule for loquat is unusually strict, and it follows directly from the tree's calendar. Flower buds form on the tips of shoots that grew during the current summer, and they open in late autumn. So the shoot that pushes out in early summer after you pick is the shoot that carries fruit for the coming season. Prune in late summer or autumn and you cut off the flower buds. Prune in winter and you cut off the developing fruit. The window that costs you nothing is the few weeks straight after the last fruit comes off.
Pruning then also gives the tree the whole warm season to respond. Cuts close over quickly in warm weather, and the new growth has months to harden and set buds before the cold arrives. A cut made in autumn heals slowly and leaves an open wound through the wet season, which is precisely how fire blight and canker get in.
The one exception is dead, broken or diseased wood, which comes out the moment you see it regardless of the season. Waiting to tidy up a blighted shoot to keep to a pruning schedule is a false economy.
| Timing | Effect on the tree | Verdict |
|---|---|---|
| Straight after harvest | New growth sets flower buds by autumn | The right window |
| Late summer | Removes shoots that are about to set buds | Costs you flowers |
| Autumn, at bloom | Removes flower trusses directly | Costs you the crop |
| Winter, fruit on tree | Removes developing fruit, slow healing | Worst option |
| Any time, dead or blighted wood | Stops the infection spreading | Always do it |
What you are trying to achieve
Loquat has enormous leaves and naturally builds a dense, dark canopy. Left alone, it becomes a shell of foliage with a hollow, unproductive interior, and the fruit ends up out of reach at the top where the birds get it first. Pruning has three aims, in this order: keep the tree low enough to pick and net, open the center so light and air reach the inner wood, and remove the structural faults that will eventually break a limb.
Height control is not optional if you want fruit. An unpruned loquat reaches twenty-five to thirty feet (7.5 to 9 m), and every job this tree needs, thinning, bagging, picking, all require you to reach the fruit by hand. Keep the working height to eight to twelve feet (2.4 to 3.7 m) by heading back the tallest leaders each year to a lower outward-facing branch. Do this consistently from a young tree and it is easy; do it once on a neglected twenty-footer and you are making large wounds.
Opening the center is the second aim. Take out branches that grow inward across the crown, branches that rub, and one of each pair of parallel limbs that shade each other. A canopy you can see daylight through ripens fruit more evenly, dries faster after rain, and gives you far less leaf spot.
The cuts to make, in order
Work through the tree in a fixed sequence rather than wandering around it. Most of the volume you remove should come from a small number of well-placed cuts at branch junctions, not from clipping the outside of the canopy. Shearing the surface of a loquat produces a thicket of weak shoots just below the cut and a darker interior than you started with.
- Dead, damaged, diseased first Remove anything blackened, cankered, broken or clearly dead. Cut back into clean wood, and on suspected fire blight go at least twelve inches (30 cm) below the visible damage. Sterilize the blade between cuts on diseased wood.
- Take out the water shoots and suckers Remove vertical shoots rising from the top of horizontal limbs and any growth from below the graft union or from the ground. These grow fast, never fruit well, and shade the fruiting wood beneath them.
- Thin crossing and inward branches Cut back to the branch collar at the junction with the limb they came from, leaving no stub. Aim to open a clear path for light down into the center of the crown rather than to remove a set quantity of wood.
- Head back the tall leaders Shorten the highest growth to a side branch that points outward and downward, bringing the working height back to what you can reach. Cut to a junction, never leave a headless stub in mid-air.
- Shorten the longest fruited branches The wood that just carried a heavy truss is often long, bare at the base and drooping. Cut it back by a third to a strong side shoot so it renews itself instead of extending further out and down.
- Stop before you have taken a third Do not remove more than about a quarter to a third of the live canopy in one season. Beyond that the tree responds with a mass of soft regrowth that will not flower and is highly vulnerable to blight.
What not to cut
Leave the short, stubby side shoots and the well-lit horizontal wood in the middle of the canopy. That is your fruiting wood, and it is easy to strip out by accident when you are focused on opening the center. If you find yourself cutting a branch that is well placed, well lit and covered in short growths, stop and reconsider.
Leave large low limbs alone unless they are genuinely in the way. Removing a major low branch from a mature loquat makes a wound the tree closes slowly, and low branches carry the fruit that is easiest to pick and net. It is almost always better to shorten a low limb than to remove it.
Do not paint or seal the cuts. Wound dressings hold moisture against the cut surface and slow the tree's own compartmentalisation. A clean cut at the branch collar, made in warm weather, closes on its own.
A neglected tree needs renovating over three years, not in one afternoon. Take a third of the excess height and a third of the crowded wood each year. Cutting a mature loquat back hard in one season produces years of vigorous unfruitful shoots and often triggers a serious blight outbreak.
Note the response, not just the cuts
Photograph the tree before and after pruning each year from the same spot. It takes a minute and it is the only way to judge whether you are actually holding the height and opening the center, because your memory of last year's canopy is unreliable.
Record the date you pruned and, in autumn, how heavily the tree flowered. If a hard prune one year is followed by a thin bloom, you cut too much or too late, and the record makes that connection obvious. Note also which limbs you shortened, so that you rotate the renewal around the tree instead of repeatedly cutting the same side.