A white ash has gray bark with ridges that form a diamond pattern, and paired compound leaves that usually carry seven leaflets with pale, whitish undersides. C shaped leaf scars beneath each side bud help separate it from the closely related green ash.

Why is a white ash easy to confuse with other ash trees?

Because green ash looks very similar. Both carry opposite compound leaves, which grow in pairs along the twig and hold several leaflets on one stalk, so the leaf underside, leaflet count, and leaf scars show most of the difference.

What does white ash bark look like?

Gray, with ridges that cross to form a diamond pattern. Descriptions range from light gray and loosely furrowed to dark gray with a ridged diamond pattern, and the twigs can be flaky or peeling.

How do white ash leaves differ from green ash leaves?

By their pale undersides and steadier leaflet count. Each leaf usually holds seven leaflets, within five to nine, and the undersides are clearly lighter than the tops, while green ash leaves look similar on both sides. Beneath each side bud, the leaf scar curves into a C, where green ash shows a less curved edge.

What else confirms a white ash besides bark and leaves?

Fall color and seeds. The leaves turn purple, yellow, or red in autumn, often early, where other ash species tend toward a uniform yellow, and each seed carries a wing, with the seeds hanging in clusters.

To raise a white ash from seed, American White Ash Seeds need a 12 hour water soak, then 30 days of warm and 60 days of cold stratification, a moist storage period that breaks dormancy, before planting 3/8 inch deep.

Frequently Asked Questions

How tall does a white ash grow?

Tall. The Morton Arboretum gives 50 to 80 feet, and the seed listing gives a mature height of 90 feet.

Where does white ash usually grow?

In forests, often alongside sugar maple. Green ash is more often found along streams and on disturbed ground.

Does every white ash produce seeds?

No. Male and female flowers grow on separate trees, so only female trees bear the winged seed clusters.

What bark signs point to emerald ash borer?

D shaped exit holes. Along with bark lesions, dieback in the upper crown, and sprouts along the trunk, these holes mark where adult beetles have bored out, and white ash is described as very susceptible to this pest.