From the USDA Natural Resources Conservation Service:

“Green ash is a native spreading, round topped tree which grows to a height of 70 feet or more. The deciduous leaves are pinnately compound, 8 to 12 inches long, with 5 to 9 leaflets. The leaflets are oblong, lustrous green on both sides or somewhat paler beneath. The twigs are pale gray along with brown bark. The fruit (samara), usually containing one seed, is light colored, 1 to 2 inches long and ¼ to 1/3 inch wide with a wing.

Green ash is found in areas with 15 to 60 inches of yearly precipitation. It is found growing naturally in bottomlands subject to frequent flooding or overflow. Green ash is moderately tolerant to shade. Some woody species associated with green ash include box elder (Acer negunda), red maple (A. rubrum), pecan (Carya illinoensis), eastern cottonwood (Populus deltoides), black willow (Salix nigra), and American elm (Ulmus americana).“