They tend to avoid plants that are sticky, poisonous, or thorny. Examples include holly, boxwood, wintergreen, sweet woodruff, bleeding hearts, and periwinkle. Shape up your trees and bushes with selective pruning. Prune only dead or diseased branches from trees. If a tree has outgrown its allotted space, consult a professional tree-trimming service.
Shrubs are easier to deal with.
Rhododendrons, hydrangea, and mountain laurel may require removal of dead, broken, or diseased branches. Cut these branches back to healthy, green wood immediately. If the wood is diseased, do not allow the trimmings to compost naturally. Remove them from your garden area to prevent contamination of healthy plants. Prune spring-blooming shrubs after they have flowered.