Title

Black Ash

(F2215 July, 2024)
File
Publication File:
Lead Author
Lead Author:
Joseph Zeleznik, Ph.D., Extension Forester
Availability
Availability:
Web only
Publication Sections

General
Scientific Name: Fraxinus nigra
Family: Oleaceae (Olive)
Hardiness: Zone 3
Leaves: Deciduous
Plant Type: Tree
Growth
Rate: Medium
Mature Height: >45’
Longevity: Long
Power Line: No
Ornamental
Flowers: Inconspicuous
Fruit: Tan samara
Fall Color: Yellow

Description

A medium to large tree which grows best in bottomlands and other moist areas. Has a higher moisture requirement than green ash. Slightly more upright and often narrower in appearance than green ash. The largest tree in North Dakota is 66 feet tall with a canopy spread of 34 1⁄2 feet.

Preferences

Light: Full sun.
Water: Prefers moist, well drained soils.
Soil: Adaptable to many soil types.

Comments

Although this tree is cold-hardy enough for North Dakota, it is not currently recommended due to its susceptibility to emerald ash borer (EAB). As of May 2022, EAB has not been found in North Dakota, though it is found in central Minnesota, Sioux Falls, SD, and in Winnipeg, Manitoba.

Black ash naturally occurs in wet sites including low wetlands, cold swamps and periodically inundated river bottoms. It will tolerate wet sites but performs better in moist well drained areas. Black ash has had mixed performance in urban areas in North Dakota, doing poorly when its moisture requirements are not met.

Credits: North Dakota Tree Selector Website, Manual of Woody Landscape Plants 6th edition.