Gadenin日本語Get the appWhere the fruit actually comes from
Understanding one detail prevents almost every pruning mistake. Pomegranate flowers form on short stubby spurs that develop on wood which is two to three years old, and those spurs sit at or near the tips of shoots rather than along their length. New growth in the current season carries the flowers, but the spurs that produce that growth take two or three years to build.
Two consequences follow. First, a bush that is sheared over like a hedge, or headed back all round each winter, has every one of its fruiting tips removed and will make vigorous leafy regrowth and very little fruit, year after year. Second, hard renovation pruning costs you two to three seasons before the crop returns, so it is worth doing properly once rather than repeatedly. The pruning a pomegranate wants is light, selective thinning: remove whole branches at their base, and leave the tips of the wood you keep intact.
| Cut | Effect on the crop | Verdict |
|---|---|---|
| Thinning a whole branch out at its base | Opens the canopy, keeps remaining tips | The main cut to use |
| Heading back every shoot by a third | Removes the fruiting tips | Avoid, this is why hedged plants do not fruit |
| Removing basal suckers | Redirects vigor into the trunks | Do this constantly |
| Shortening one over-long whippy shoot | Small loss, restores balance | Fine in moderation |
| Cutting out a dead or crossing branch | No loss, prevents rubbing wounds | Always do it |
Timing
Do the structural pruning in late winter while the plant is fully dormant and leafless, after the worst cold has passed but before the buds move. You can see the framework clearly, wounds close quickly as growth starts, and you are not removing wood that has already invested in the coming crop.
Sucker removal is a separate job on a different clock, done two or three times through the growing season while suckers are still soft and green. Do not do heavy structural pruning in late summer or autumn: the regrowth it triggers will not harden before winter and is the wood most likely to be killed by frost.
Building the framework in the first three years
The early decision is single trunk or multi-stem. A multi-stem bush of four to six trunks is the safer form anywhere winters can get hard, because a killed trunk is replaced from the base rather than losing the whole plant. A single trunk is neater, lets you work and mulch underneath, and suits a warm climate or a wall-trained fan.
- Year one, choose the trunks In late winter, select four to six strong, well-spaced shoots from the base for a multi-stem bush, or a single leader for a standard. Cut everything else out flush at the base. Do not shorten the shoots you keep.
- Year one, clear the lower stems Rub off buds and shoots on the lower twelve to eighteen inches (30 to 45 cm) of the trunks you have chosen, so they stay clean and light reaches the mulch.
- Year two, thin the branching Let three to five main branches develop on each trunk, spaced around the stem and not stacked one above another. Remove anything crossing, inward-facing or rubbing. Still no heading cuts.
- Year three, open the center Take out whole branches where the canopy is congested so that light reaches the interior. Fruit colors badly in shade and the inside of a dense pomegranate goes bare and stays bare.
- From year four, maintain only Each winter remove dead, damaged, crossing and inward wood, thin one or two whole branches where it has thickened, and stop. Ten minutes a year on an established bush is enough.
Sketch the framework you chose in your notes, or photograph the bare bush after the first winter's pruning. Comparing that photograph to the same view three winters later shows you exactly how much the bush has thickened, which is hard to judge by eye.
The maintenance cuts, in order
Work through an established bush in the same sequence each winter and you will not over-prune, because most of what needs removing turns out to be dead or misplaced wood rather than good branches. Aim to remove well under a quarter of the live wood in any one year.
- Dead, broken and diseased first Cut back to sound wood or right out at the base. This alone often completes the job on a young bush and is the only pruning that has no downside.
- Suckers and low water shoots Everything from the base that is not a chosen trunk comes out flush. Trace wandering suckers back to the running root and cut them there.
- Crossing and inward-growing branches Rubbing branches make wounds that admit rot, and inward branches shade the center. Remove the weaker of any crossing pair, cutting at its point of origin.
- Thin for light, one or two branches Stand back, find the densest part of the canopy, and take out one or two whole branches at the base to open it. Resist the urge to tidy the outline afterwards.
- Leave the tips alone Do not go round shortening the remaining shoots to neaten the shape. Those tips carry the spurs and the spurs carry next season's flowers.
Renovating a neglected thicket
An old pomegranate that has never been pruned becomes a mound of thirty stems with all the fruit out of reach on the outside and nothing but dead twiggy wood within. It can be recovered, but do it over three winters rather than one. Cutting the whole plant to the ground produces a forest of suckers and no fruit for years.
Each winter, remove about a third of the oldest, thickest and most congested stems at ground level, keeping the younger well-placed ones, and remove all the new basal suckers except the two or three best-placed replacements. By the third winter you have a bush of four to six manageable trunks of mixed ages, and fruiting recovers as the retained wood builds new spurs. Throughout, cut whole stems out at the base and avoid shortening what remains.
Do not paint or seal the cuts. Clean cuts flush with the base, made in late winter, close on their own; sealants trap moisture against the wound and do more harm than good.