Services Tree Pruning.

May-summer is best: Mountain Ash: Later winter / early spring: Mulberry: Anytime: Oak: November-March (to prevent oak wilt) Pears: After bloom is best: Plum: After bloom is best: Poplar: Late winter / early spring. Aug 13, Late fall/winter pruning is especially important for oak trees to help prevent spread of the fungus that causes oak wilt (see University of Wisconsin Garden Facts XHT).

Late spring and summer are usually not good times of year to prune because disease pathogens are present and wound closure is slower. Aug 20, When to Prune, by Tree Type.

Deciduous. These are the trees which shed their leaves each year.

Tree structure and form can be improved and maintained by proper pruning.

Most deciduous trees should be pruned in late fall to winter, according to the Young Trees. Subtropic. Flowering Trees. New Trees. Estimated Reading Time: 6 mins. Aug 13, In early summer, you can also remove 2∕3 of an unbranched tip to keep the tree fuller.

Hemlocks, arborvitae, and yews: These evergreen trees and shrubs have latent (dormant) buds farther back down the stem. Therefore, you can shear these evergreens in late spring or early summer after new growth has expanded.

Dec 14, Wintertime is a good time for tree pruning, when temperatures are cold, according to Wisconsin Department of Natural Resources tree health experts. An oak tree dying from oak wilt (middle) and an oak killed by the disease (right).Estimated Reading Time: 3 mins.