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Pruning advice for fall

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Courtesy of Donna Williamson

(Read caption) The flower buds on this dogwood develop over the summer and if you prune the tree in later summer or fall, you cut off the buds and the tree won't flower next spring. That's the main reason reason that the best time to prune spring-flowering trees and shrubs is just after they finish blooming.

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This is my best advice on fall pruning for homeowners who finally have time to prune in August and September: Stop.

Don’t get carried away with late-summer and fall pruning.

Reasons not to prune in fall

One reason is that spring-flowering shrubs have already set their flower buds for next spring. If you prune those shrubs now, you cut off next spring's flower buds, which means you won't have any flowers.

So, avoid heavy pruning of forsythia, quince, heirloom and New Dawn roses, mophead and oak-leaf hydrangeas, witch hazel, dogwood, cherries and other ornamental and fruit trees, pieris, azalea and rhododendron, corylopsis, mahonia, magnolia, silverbell, fringe tree, lilac, bridal veil and other early blooming spirea varieties, early viburnum species, redbud, early clematis (especially montana varieties), kolkwitzia, and kerria.

Another reason not to prune in later summer or early fall is that heavy pruning can stimulate lush regrowth if the weather is warm. When that regrowth occurs near a killing frost, the new growth is killed, having not had time to harden off before cold weather.

This is costly to the plant. Better to wait until the plant is fully dormant, when the weather has turned cold, to prune trees and shrubs.

Pruning of evergreens can easily and safely be done around the December holidays to provide greens for decorating. Two birds, one stone.

When pruning roses, cut only long canes or stems that can whip around in hurricane or winter winds. Don’t cut them down below about two feet high.

Winter weather routinely damages rosebushes, and in the spring you will need to reprune heavily to get rid of dead wood and get them off to a good start. If you prune heavily in the fall, there will be no wiggle room to prune off winter-killed material.

Late fall and winter are wonderful times to prune. With the leaves gone, you can easily see structural problems. Remove broken and damaged branches. Branches that rub against one another should be examined. Usually only one needs removal or shortening.

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