Green Ash
Fraxinus pennsylvanica

Height: 50-60´
Habit: oval, irregular
Landscape Value:

The green ash is an extremely adaptable and fast-growing tree. It transplants easily, can survive almost anywhere, and is found in the wild, often growing next to streambeds. For these reasons, the tree has been widely used for lawns, parks, and streets. It is considered overused by some experts. Green ashes are handsome all-purpose shade trees but do suffer from a variety of pests and diseases. A healthy tree in a prime location can avoid most of these problems, but homeowners should beware. Watering during times of drought can keep these trees vigorous and help to avoid pests. The green ash is also weak-wooded and susceptible to breakage. It is best to grow seedless cultivars of known good form than to trust your landscape to seedling trees. They are better-suited for parks than yards.

Seasonal Characteristics:
  • Summer: The green ash is an adequate shade tree and has lustrous medium-to dark green leaves. The irregular habit of seed-propagated forms can be less appealing than many other shade trees.

  • Fall: Leaves can turn a spectacular yellow but are variable, and often color is not good. Samaras, fruits similar to the winged fruit of maples, form in August and persist on into the winter. They can be heavy and unsightly as well as a maintenance problem, for they freely seed themselves anywhere they gain a foothold. Fruitless (male) varieties are available and definitely recommended. Cultivars for improved fall color are available as well.
Points of Interest:

The wood of green ash is heavier than that of white ash, but it resembles white ash in most of its desirable characteristics, including strength and durability. Native Americans used ash for medicinal purposes, and the seeds were considered an aphrodisiac.

 

Native Range:

Illinois, and a wide range through most of the eastern half of the U.S. except Florida south of the Panhandle. Usually found in wet areas and along streams and riverbanks.

Link to Green Ash

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This web site is maintained by David Williams, Director of the University of Illinois Arboretum, Professor and Extension Specialist in Horticulture, Department of Natural Resources and Environmental Sciences, and by C Diane Anderson, Extension Specialist in Horticulture, Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana-Champaign, Champaign, IL.