Identify ash trees by looking at how the branches and leaves grow. These trees are popular with homeowners because they grow more quickly than other trees. However, they are prone to storm damage and insects.
Ash trees have opposite branching, which means the side branches grow across from each other. They have compound leaves, which are made of several leaflets. Ash trees have between five and nine leaflets on each leaf. A young ash tree has smooth bark, but as it grows older, the bark develops a diamond-shaped pattern.
Ash trees are popular with homeowners because they grow more quickly than other trees. Two types of ash trees commonly sold in garden centers are green ash and white ash. Green ash is cold tolerant, and the leaves turn gold in the fall. White ash is seedless, and the leaves turn a deep purplish-red in the fall.
Early or late snowstorms can damage ash trees. These trees should be pruned about every four years to remove the damage and help the trees keep a natural shape. Insects that commonly attack ash trees include the oystershell scale and ash sawfly. The emerald ash borer poses the greatest danger to ash trees, since damage caused by this insect makes the ash tree grow more slowly, develop discolored leaves and eventually die.