Prune your crabapple tree in the later winter or early spring before it starts to bud.
Cut branches and limbs with your pruning shears or saw at a 30 degree angle to the main trunk of the tree for better wound healing.
Remove any branch or limb that appears diseased or damage at any time of year. A disease can spread rapidly harming the entire tree if not removed and a damaged limb could further injure the tree or fall and hurt a person or property.
Thin out branches that are crossing other branches to allow more light into the center of the tree.