Short answer: Dead, broken or hazardous branches can come off at any time. For most routine pruning, late fall through winter is a good window for many trees, and hedges do best with light, regular trims through the growing season. Timing varies by plant, so it is worth checking before you cut.
Check for nests first
Many birds nest in trees and hedges in spring and summer, and active nests are protected in California. Look before you trim, and put off the work if you find an active nest.
Trees
Remove dead and hazardous branches whenever you spot them. Thin and shape most trees while they are dormant or growing slowly. Avoid heavy cuts in hot weather, and never remove more of the crown than the tree can afford to lose.
Hedges
Light, regular trims keep a hedge dense and tidy. Cutting back too hard in one go can leave bare patches, especially on conifers, which often do not regrow from old bare wood. Keep the hedge slightly wider at the base than at the top so light reaches the lower growth.
Flowering shrubs
Many flowering shrubs are best pruned right after they bloom, because cutting before bloom removes the flowers. If you are unsure, ask us before the shears come out.
Palms
Remove dead fronds. Stripping green fronds back hard weakens a palm and does not help it.
When to call a certified arborist
Large trees, trees close to power lines, and trees with signs of disease or structural problems are best left to a certified arborist. We will tell you honestly when a job is beyond what we should take on.
This is general guidance. Every yard is different. If you would like us to look at yours, call us or send a request.