When to prune apple trees

Late winter to very early spring while dormant, after the coldest weather and before buds swell. Apple trees (Malus domestica) flower on old wood, which sets the timing. Type your town for the dates at your weather station.

How to prune apple trees

• Home apple trees are usually trained to a central leader: one main trunk that stays the tallest point, with tiers of side limbs that get shorter toward the top.
• Thinning cuts that remove a whole branch back to its origin cause less regrowth than heading cuts that shorten a branch partway.
• Remove dead, broken, crossing and inward-growing branches first, plus root suckers and most water sprouts.
• Young trees need very few cuts in the first 1 to 3 years. Too much early pruning delays flowering.
• Water sprouts can be rubbed or pulled off in late spring or early summer while still soft, which causes less regrowth than cutting them in winter.
• Apple flower buds sit mostly on spurs, short stubby shoots that grow on wood two years old or older.
• A newly planted unbranched apple whip is usually headed back to about 30 to 36 inches to start the first tier of branches.
• Young side limbs are spread to about 60 degrees from the trunk with spreaders, which stay in for at least one growing season.
• Leave a vertical gap of about 2 to 3 feet between tiers of limbs so light reaches the lower branches.
• A full-size apple on a seedling rootstock can reach 30 feet or more tall and 30 to 40 feet across, so it needs regular pruning in the top to stay workable.

What to avoid

• Do not prune in early winter. Fresh cuts lower cold hardiness in the nearby wood before the tree is fully hardened.
• Do not wait until after buds swell. Late cuts knock off flower buds and can weaken the tree.
• Avoid heavy pruning in one year. Over-pruning triggers a flush of upright shoots and lowers the crop, so spread a big renovation over 2 to 3 years.

Pruning window by zone

Counted from the typical last frost of each zone (the middle value among its towns of 10,000 people or more). Buds swell earlier in a warm spring, so watch the plant as well as the calendar.