Green Ash

Fraxinus pennsylvanica Marsh.



All photographs are copyrighted and are the property of E. Brunner.

Family:  Oleaceae

Native or Introduced to Illinois:  native

Natural Habit in Illinois:  rich bottomland forests

Leaf:  Leaves are opposite, pinnately compound, 4 to 6 inches long, 7 to 9 leaflets, narrowly elliptical, long-pointed, entire, bright green above, paler below.

Flower:  Dioecious, both sexes lacking petals, occuring as panicles. Flowers appear after the leaves unfold.

Fruit:  A one-winged, dry, flattened samara with a slender, thin, seed cavity, maturing September to October and dispersing over winter.

Twig:   Stout to medium texture, gray to green-brown and either glabrous or pubescent, depending on variety. Leaf scars are semicircular, lacking the notched top.

Bark:  Ashy gray to brown in color, with interlacing corky ridges forming obvious diamonds. Older trees may be somewhat scaly.

Size/Form/Shape:   Green Ash is a deciduous, medium-sized tree with an open, irregular crown reaching about 50 feet in height.

County Distribution Map for Illinois:  


Sources for the Sullivan Middle School Tree Identification Guide were obtained though the use of the following sites:

The information below is from the National Arbor Day Foundation.  This information can be viewed in the original (source) form by visiting The National Arbor Day Foundation at

Sun Exposure:  This ash does well in Full sun.
Soil Type:  The Green Ash grows in acidic, alkaline, loamy, moist, clay, sandy, wet, well-drained, wide range of soils. T
Moisture:  It prefers wet soil conditions, and has slight drought tolerance.
Growth Rate:  This tree grows at a fast growth rate.

Hardiness Zones:  2 - 9
The Black Walnut can be expected to grow in the temperature extremes of the zones shown in color in this hardiness zone map.