Green ash are more adaptable, cold tolerant and have golden fall color. There are three common varieties. Patmore has a pyramidal to oval shape and is seedless. Summit is more upright, but can produce some seeds. Marshall's Seedless has a rounded growth form, is seedless and less cold hardy than Patmore and Summit.
White ash is known for purplish fall color.
Autumn Purple has been selected for its intense red-purple fall color and is seedless. Ash trees are home to many Insects. The most common are ash sawfly, ash borer and oystershell scale. Ash borer is the most serious because it can kill the tree. Permission is hereby given to duplicate this Plant talk Colorado TM script as is if credit is given to the sources.