Pruning your tree is a double-edged sword. If done properly it can improve a tree’s health, form, structure and safety. But if it is done improperly (without an understanding of tree biology) it can be the worst thing you can do for your tree, causing stress, declining health, internal decay, un-safe conditions, and sometimes tree death. It all depends on how much you prune, and the types of cuts you make, or the professional you hire.

There are some excellent publications and resources that will help you learn:
how to make proper pruning cuts
the reasons to prune
what season is best for pruning and when shouldn’t we prune trees
how to prevent internal decay
how to improve a tree’s form and structure
how much can be pruned without harming the tree
when should I find a professional to prune my trees
how to find a professional – ISA Certified Arborist
Pruning Landscape Trees a Penn State University publication
Pruning Ornamentals a Penn State University publication (the printed version of this 24 page book costs $4.00)

How to Prune Trees a USDA Forest Service publication
Tree Pruning Website an excellent Tree Pruning website developed by Dr. Ed Gilman, author of “An Illustrated Guide to Pruning” and Horticopia Expert Notes – Illustrated Pruning and Planting
National Arbor Day Foundation Pruning Website an interactive website that allows you to test your tree pruning skills and knowledge. Give it a try!
Pruning Young Trees – Information from the International Society of Arboriculture (ISA) on Pruning Young Trees
Pruning Mature Trees – Information from the International Society of Arboriculture (ISA) on Pruning Mature Trees
Don’t Top Trees – Urban Tree Foundation Tree Topping Website
Download a Presentation on Tree Pruning from Penn State Extension
Site Design and Coding by MLB Advertising