Green Ash


Green Ash

Green Ash



General Description

A hardy, native, drought and alkali resistant medium to large

tree. Since the onset of Dutch elm disease, Green Ash has been

over-planted in urban and conservation settings as a replacement

for American Elm. The largest tree in North Dakota is 69 feet tall

with a canopy spread of 74 feet.

Leaves and Buds

Bud Arrangement – Opposite.

Bud Color – Terminal buds are scaly, dark rusty-brown, and

somewhat woolly.

Bud Size – 1/8 to 1/4 inch.

Leaf Type and Shape – Pinnate compound, 5 to 9 stalked leaflets.

Leaf Margins – Sharply-serrate to finely-toothed.

Leaf Surface – A few hairs along main veins below or occasionally

pubescent below, glabrous or pubescent twigs and petioles.

Leaf Length – 10 to 12 inches; leaflets 3 to 4 inches.

Leaf Width – 5 to 7 inches; leaflets 1 to 2 inches.

Leaf Color – Bright green on both surfaces, sometimes paler

below. Clear yellow fall color, with early leaf drop.

Flowers and Fruits

Flower Type – Dioecious, unisexual flowers are produced in large,

dense clusters, hairy; anthers are linear-oblong, on short


Flower Color – Greenish-yellow.

Fruit Type – Samara, 1 to 2 inches long, with wing lanceolate

and decurrent to below the middle of the seed.

Fruit Color – Light-brown to tan in color.


Growth Habit – Variable.

Texture – Medium, summer; medium-coarse, winter.

Crown Height – 35 to 65 feet.

Crown Width – 30 to 40 feet.

Bark Color – Bark is ash-gray to brownish on older branches

and furrowed into close diamond-shaped areas separated

by narrow interlacing ridges.

Root System – Roots are shallow, fibrous, and wide spread.

Environmental Requirements


Soil Texture – Adapted to a wide variety of soil textures.

Soil pH – 6.0 to 8.0.

Windbreak Suitability Group – 1, 1K, 2, 2K, 3, 4, 4C, 5, 6D,

6G, 8, 9C, 9W, 9L.

Cold Hardiness

USDA Zone 2.



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