Common Name: white ash
Hardiness Zone: 3 to 9
Height: 60 to 80 ft
Width: 60 to 80 ft
White ash is native to the forests of the Midwest. White ash was a favored urban tree for its large size canopy resembling American elm (Ulmus americana). It has wonderful purple fall foliage, can withstand some of the harshest urban environments, and has a better form than its relative green ash. Dark and nearly smooth bark on young twigs and branches and a more greenish-brown on older trees. The bark is covered in narrow ridges that form deep diamond-shaped fissures. Leaves are opposite on the stem, length of 8" to 12", pinnately compound with five to nine plainly stalked, and sharp-pointed leaflets. Dark green and smooth on top and pale green on the bottom. The fruit is a winged samara that resembles a canoe paddle with the seed toward the handle.
Where it grows:
White ash prefers moist, well-drained soils. It is tolerant to dry sites with alkaline or clay soils, it will tolerate road salts.
How it’s used:
Due to its susceptibility to the emerald ash borer, this tree is unsuitable for the landscape.
Surviving trees make great hosts for game birds, insect pollinators, small mammals, and migrant birds.
Where it is native to:
Native to the Eastern United States. Found only in the southeastern part of the state; grows best in rich soil; intermediate in shade tolerance.
Highly susceptible to the emerald ash borer, an insect whose larva bore into and girdle the tree often killing it over several seasons.
The Morton Arboretum (Trees & Plants) found online: https://www.mortonarb.org/trees-plants/tree-plant-descriptions/white-ash-not-recommended
Minnesota Department of Natural Resources (Trees) found online: https://www.dnr.state.mn.us/trees/white-ash.html