How to trim your tree?
Trimming the correct way ensures good health of the tree. To trim properly, remove all Dead, Damaged and Diseased (remember, 3 D's) limbs and branches from the tree. As well as that, remove all branches that are crossing each other. This will prevent further damage and will decrease the chance of disease.
Why trim your trees?
Removing all the appropriate branches and limbs thus will increase airflow within the tree, decrease the risk of falling branches during windy/stormy days and will better the health of your trees making them look a lot healthier and presentable.