Why it matters
Every cut is a wound. The tree must seal it with callus, then reroute the sugars and hormones that were feeding the lost branch.
Done well, a cut steers energy into fruit, opens the canopy to light, and removes disease before it spreads. It's also one of the few moments you actively shape what the tree will be in twenty years. Done badly, the same cut triggers weak regrowth, invites rot, and shortens the tree's life by decades.
Work with the tree's form. Don't fight it. The best pruners I've watched stand back as much as they cut. They read the tree, mark three branches, then walk around it once more before the saw comes out.
When to cut
Two windows. They do opposite things.
Winter. Prune leafless trees in late winter, four to six weeks before bud break. You can read the whole structure: leader, scaffold, laterals, deadwood. The tree wakes up and pushes vigorous spring growth into the wounds you left. This is when you do structural work in a food forest. Scaffold limbs, crossing branches, opening the centre.
Summer. Cutting during active growth slows the tree. You're removing working leaves, so you're removing sugar production. Use summer to calm vigorous trees, reduce height, thin a dense canopy, and strip out water sprouts before they harden. Mid to late summer also exposes disease clearly. Cankers, fireblight strikes, and silver-leaf flagging all show in leaf, so this is when you cut them out.
A useful rule: prune in winter to push growth, prune in summer to hold it back.
The three cuts
Three cuts cover almost everything. Knowing which one to make is the whole craft.
Thinning. Removes a whole branch back to its origin, where it joins the trunk or a larger limb. The single most useful cut. Opens the canopy without provoking regrowth, because no stub remains for the tree to respond to. Cut just outside the branch collar, the swollen ring where the branch meets the trunk. The collar holds the tree's wound chemistry. Cut into it and healing stalls. Leave a long stub and rot moves in within a season.
Heading. Shortens a branch back to a bud or small lateral. Buds below the cut break and push new growth. Useful for shaping young trees and forcing branching in a leggy scaffold. Overused, it produces a tangled, weakly attached mess. Cut at a slight angle, 5 mm above an outward-facing bud, so new growth pushes away from the centre.
Reduction. Shortens a branch back to a lateral at least one-third the diameter of the branch you're removing. The right way to lower a mature tree without leaving stubs. Never top a tree. Stubbing the leader destroys its architecture, produces weakly attached water sprouts, and cuts decades off its life. Topped trees rarely recover.
Sealing large wounds
Small cuts seal themselves. Anything over 2 cm in diameter is exposed heartwood, open to fungal spores and standing moisture while callus slowly closes in from the edges.
Modern arboriculture leaves wounds open. On fruit trees in wet climates, that advice fails. A natural dressing buys the tree time while the callus advances.
The blend. Roughly one part beeswax to one part pine or spruce resin, melted over low heat. A spoonful of linseed oil keeps it pliable once cooled. Spread it warm with a palette knife or the back of a spoon. It seals out water and spores, stays breathable so the wood doesn't trap anaerobic moisture, and breaks down over a year or two as the callus closes in.
Apply within an hour of cutting, while the wound is fresh. Cover the heartwood and sapwood. Stay off the bark and the collar, since that's where callus forms and it needs to breathe. Skip dressing on anything under 2 cm. The tree closes those itself in one growing season.
Avoid petroleum-based sealants. They crack in the sun, trap anaerobic moisture against the wood, and leave a synthetic residue in the tree's vascular system.
Where it goes wrong
Too much, too fast. Don't remove more than a quarter of the canopy in one year. Cross that line and you shock the tree, drain its reserves, and provoke a flush of water sprouts the following spring. A neglected tree gets fixed over two or three seasons, not one. Patience compounds.
Wrong season for the species. Stone fruits (cherries, plums, apricots) get pruned in summer, never wet winter. Silver leaf and bacterial canker walk straight in through cold, damp wounds. Apples, pears, and native oaks take winter pruning fine. Evergreens want light work only, in late spring after the first flush hardens.
Dull, dirty tools. Ragged cuts from blunt secateurs tear bark and slow sealing. A clean cut closes in half the time. Wipe blades with methylated spirits between trees, especially after cutting out disease. Bypass secateurs for live wood. Anvil pruners for dead. A folding pruning saw for anything larger than your thumb. Sharpen everything once a season.
Cutting flush. Beginners often saw the branch off level with the trunk, taking the collar with it. The wound looks tidy and seals badly. Always leave the collar intact.