When is the Best Time of Year to Prune Trees? There is never a bad time to remove dead, damaged or diseased branches. But most trees benefit from pruning in mid to late winter. Pruning during dormancy encourages new growth as soon as the weather begins to warm.

When should you not trim trees?

Pruning during the growing season always stimulates new growth. During summer's heat, having to produce that ill-timed new flush of growth greatly stresses a tree. Pruning in the fall is even worse as it prevents the tree from going into a natural dormancy.

What angle should trim be cut at?

Slice a trim board at a 45-degree angle.

You will need a miter saw to cut the trim at an angle and form a corner. Miter saws have adjustable bases you set to the angle you wish to cut.