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Now Is the Worst Time to Prune Trees, a Gardener Says—What You Should Know

Some trees can be pruned in winter, while other trees grow better when they’re pruned in spring. But no matter what types of trees you’re growing, early fall is the worst time to prune trees. Pruning just before winter makes trees more vulnerable to frost damage, but it can also reduce...

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Some trees can be pruned in winter, while other trees grow better when they’re pruned in spring. But no matter what types of trees you’re growing, early fall is the worst time to prune trees.

Pruning just before winter makes trees more vulnerable to frost damage, but it can also reduce fruiting and flowering, and even increase the incidence of plant diseases.

If you’re not sure when to prune the trees in your garden, here are the best and worst times to prune different types of trees, plus a few pruning tips that will help your trees grow better.

Why Shouldn't You Prune Trees in Fall?
In the early months of fall, trees are hard at work storing energy to carry through winter. Pruning trees at this time of the year can limit their ability to store nutrients, but it can also increase the chances that their tender leaves will be damaged by frost.

Fall pruning can also make certain trees more vulnerable to pests and disease, and it may inhibit blooming if you accidentally clip away the flower buds on flowering trees.

Broken, diseased, and damaged branches can be pruned away at any time of the year to keep issues from spreading. But more significant pruning and reshaping should only be performed at certain times of the year—and it should be avoided entirely from late summer to early fall.
The Right Time to Prune Trees
In general, the best time to prune most trees is during their winter dormancy period or from November to March; however, as you’ll soon see, some tree varieties are pruned a bit differently.

Certain trees have specific pruning recommendations, so it’s always a good idea to research the pruning needs of the trees in your garden before picking up your pruning shears.

Tip
If you’re in doubt about tree ID, a tree care professional or your local cooperative extension office may be able to identify your plants for you (and offer some pruning advice too).

Deciduous Trees
Deciduous trees, like oaks, maples, and many common landscaping trees, lose their leaves in winter, so it’s important to avoid pruning them in early fall when they’re storing energy.

Instead, these plants grow best when they’re pruned during their winter dormancy period, which lasts from late fall to early spring before the plants leaf out.

Pruning in winter when trees are leaf-free makes it easier to see the tree’s branches and your pruning cuts, but it also reduces the incidence of tree diseases, like oak wilt.

Flowering Trees
Some deciduous trees produce flowers, but how the flowers form influences how the trees need to be pruned. Using different pruning techniques for new wood and old wood trees will ensure your trees flower well.

New Wood Trees: Trees that bloom on new wood or that flower from summer to fall are usually treated like deciduous trees and pruned during their winter dormancy period. Crepe myrtles fall into this category, as do panicle hydrangeas, smoke trees, and rose of Sharon.
Old Wood Trees: Flowering cherry, apricot, lilac, dogwood, and other trees that flower early in spring generally bloom on old wood and form their flower buds during the previous season of growth. To ensure you don’t damage flower buds, prune these trees immediately after they finish flowering and never prune them in fall or winter.
Fruit Trees
Trees that are grown for their edible fruit can usually withstand light pruning at the end of summer, but it’s best to save major pruning for late winter.

Pruning fruit trees in spring or summer makes them more vulnerable to fire blight and other diseases, while pruning in autumn can cause newly cut branches to dry out or die back. Hawthorns, crab apples, and other close relatives of apple trees should be pruned during their winter dormancy too.

Evergreen Trees
Evergreen or conifer trees usually don’t need significant pruning. But if your spruces, hemlocks, firs, and pines need a trim, late winter to early spring is the time.

Evergreens, like arborvitae and yew trees, are a bit more flexible and can be pruned through mid-summer—just as long as you don’t prune them in hot weather.

Palm Trees
Pruning times are a little more forgiving in areas with mild winters, and tropical palm trees can technically be pruned at any time of the year if their fronds start to droop or turn brown.

If you can wait, spring is the best time to prune most palm trees. This will allow you to clean up any fronds damaged during hurricane season and the pruning cuts will heal faster as well.

Young Trees
Newly transplanted trees are handled a bit differently than established trees since they are more delicate and have fewer branches to trim away.

For best results, only prune dead or broken branches when transplanting new trees into your garden, and make more significant pruning cuts when the trees are dormant in winter.

Go slow with young trees and prune just a few branches at a time, then make more pruning cuts as your trees grow to improve their shape.

Why Should You Prune Trees at All?
Not all trees need to be pruned, but many trees grow, fruit, and flower better if they’re pruned in the right way and at the right time. Although trees can be pruned for a variety of reasons, some of the main perks of pruning include:

Improved shape. Pruning removes wayward branches and helps refine the shape of trees as they grow. You can also use pruning to train trees into fun shapes or trim trees to keep them small!
Better fruiting and flowering. Pruning is especially beneficial for fruit trees, but it can also make flowering trees bloom more abundantly. By improving airflow and sunlight access, pruning can boost fruiting and make fruit taste even better.
Reduced pests and diseases. If pests and diseases invade, infested branches can be pruned away to keep problems from spreading. But you can also use pruning preventatively to increase air circulation and reduce the incidence of plant diseases, like mildew.
Fewer broken branches. Some types of branches, like “waterspouts,” are prone to breaking, which can introduce pathogens into a tree’s break. Removing these branches preventatively can help you avoid issues later on.
Enhanced wound healing. Trees have a hard time healing ragged breaks in their branches. But if you prune broken areas away, the tree will heal faster.
Safety. Overgrown branches can be a safety hazard, especially if they reduce visibility around your driveway or are growing into power lines. Pruning damaged limbs before they fall is always a wise choice.

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