![]() ![]() ![]() Thinning should be done in the winter, although limited thinning can be done in the spring. Some thinning is done to reduce wind resistance however, this is not really necessary because trees often need their entire branch structure to support each individual branch. Thinning Pruning branches from a tree for aesthetic purposes.This can be done at any time of the year but is not necessary unless the dead branch becomes a hazard. Deadwooding Removing dead branches from a tree.This can be done at any time of the year and should be done before the suckers get bigger than ¼-1/2 inch. Sucker pruning Clipping the suckers that grow from the base of the tree.Trees should not be raised more than a foot or two during one pruning cycle, and a large number of branches should never be removed at one time. Low limbing Removing the bottom limbs of a tree in order to establish clearance heights that meet City Code or provide visual clearance.View the Urban Forestry Events Calendar for upcoming workshops. Hands-on tree pruning classes are offered by Urban Forestry at different times of the year. Click here to learn more about Dutch elm disease. Pruning cuts can attract the elm bark beetle, which is the major vector of Dutch elm disease. The City of Portland has a ban on pruning elm trees during the growing season (from April 15 to October 15). Avoid pruning in the spring to prevent damage to delicate young leaves and buds. ![]() Light pruning will have little impact on future growth, but heavy pruning may slow or dwarf your tree’s growth Keep in mind that pruning during the growing season removes leaf surface that is manufacturing food for next year’s growth. Limited pruning is okay in the summer.Because most trees in Portland experience seasonal dormancy, pruning live branches during the winter months encourages vigorous new growth in the spring without depriving the tree of actively photosynthesizing tissues.Broken and dead branches as well as root suckers can and should be pruned at any time of year.Generally speaking, the following guidelines apply: Some say it’s best to prune a tree “any time the tools are sharp.” However, understanding how your tree will respond to pruning will help you make the best decisions for your tree. You can prune a tree anytime of the year. Download PDF file Street Tree Pruning Standards 216.99 KB ![]()
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