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Why Prune in Late Winter or Early Spring?

In temperate regions, most plants go dormant during the winter. This is the time of year when they’ve halted active growth and have hunkered down for the cold weather. Because of this dormancy, late winter and early spring are typically the best times to adjust the shapes of many trees and shrubs. Why?

1. Pruning while a plant is dormant makes it easier for the plant to recover, which is vital for next year’s flowers.
2. By pruning before any new growth starts, the plant puts energy towards producing new, healthy growth when the warmer temperatures of spring roll around.
3. Practically speaking, it’s also a lot easier to see the true shape of deciduous plants in the winter, since their foliage is gone.

When to Prune Flowering Shrubs

When you should prune is often tied to one question: When do your shrubs flower? The spring-flowering shrubs such as azaleas get pruned after they bloom in late spring or summer.  The summer-flowering shrubs such as butterfly bush can be pruned in winter or early spring. Why? It’s related to whether flowers bud on “old” wood or “new” wood:

• In late winter and early spring, prune shrubs that form their flower buds on “new” wood (i.e., growth that will occur in the coming spring). Examples include: abelia, beautyberry, butterfly bush, summer- or fall-blooming clematis, smooth hydrangeas, panicle hydrangeas, potentilla, roses, rose of Sharon, dogwoods, Japanese spirea, St. Johnswort, and summersweet.
• Wait until late spring or early summer (after flowers fade) to prune shrubs that bloom on “old” wood (i.e., growth from the previous year). Examples are: azalea, beautybush, bridalwreath spirea, spring-blooming clematis, cotoneaster, deutzia, enkianthus, flowering almond, forsythia, mophead hydrangeas, lilacs, mock orange, mountain laurel, ninebark, oakleaf hydrangea, pieris, rhododendron, viburnum, Virginia sweetspire, weigela, wisteria, and witch hazel. If you cut them too early, you’ll cut off the buds that would’ve opened this spring! The best time to prune spring-blooming shrubs is right after the spring blooms fade.

When to Prune Trees and Evergreens

• Prune evergreen shrubs (yew, holly, and boxwoods) and evergreen trees (spruce, fir) in late winter or early spring when they are still dormant and before new growth begins. Pines are pruned in early June to early July.
• Prune shade trees, such as oak, sweetgum, maple, katsura, and hornbeam, in late winter or early spring.
• Wait to prune spring-flowering trees, such as dogwood, redbud, cherry, pear, and magnolia, until after they flower.

Sometimes, it’s hard to tell if a tree has dead branches higher up unless you climb it. For this reason, it may be prudent to hire a tree trimmer to prune any dead trees once every three years. To prune shorter trees yourself, look into tree pruners with long-reach poles to keep your feet safely on the ground.

General Cold-�������� Pruning Tips

• Prune on a mild, dry day. Not only is this more pleasant for you, the gardener—but it also helps to prevent the spreading of waterborne plant diseases or damage from cold temperatures.
• Never prune too early in the winter, as incisions can dry out if the temperature drops well below freezing. 
• When pruning, first prune out dead and diseased branches, especially those caused by the winter’s snow and ice. 
• Unwanted lower branches on all evergreen shrubs and trees should also be removed in late winter.
• Remove overgrown and smaller branches to increase light and air at the tree’s crown.
• Your goal is to keep the branches that develop or maintain the tree’s structure.
• Cut branches at the node, the point at which one branch or twig attaches to another.

See our Pruning Guide for more pruning pointers!