D-49 Tree Service License Requirements To obtain a tree service license in California, you must demonstrate a minimum of 4 years of officer-level experience and pass a two-part state exam with the State Contractor Licensing Board. A tree service contractor prunes trees, removes trees, branches, or stumps (including grinding), and is engaged in the placement of trees or branches. It prunes trees, removes trees, branches or stumps (including shredding) and is dedicated to placing trees or branches.
Pruning removes dead and dying branches and stems, leaving room for new growth and protecting your property and bystanders from damage. It also prevents pest and animal infestation and promotes the natural shape and healthy growth of the plant.
If a tree repeatedly loses too much of its crown at once, it may weaken or even die from stress. That's why you shouldn't cut more than 25% of a tree's crown at a time.