Black Ash
Fraxinus nigra

Location in Ontario
Black Ash grows throughout the Carolinian Zone and northward. Black Ash prefer wet, swampy locations.

COSEWIC (Committee on the Status of Endangered Wildlife in Canada) Status: Black Ash is identified as a Threatened species. This is due to the loss of trees from the Emerald Ash Borer.

COSEWIC: Black Ash

Black Ash trees at the University of Guelph Arboretum

Genus Fraxinus
Leaves: Compound, opposite
Flowers: Monoecious or dioecious
Fruit: Samaras (a seed in a papery tissue)
Ontario Species: Black Ash, Red Ash, White Ash, Pumpkin Ash (Carolinian), Blue Ash (Carolinian)
Other facts:
*Ash trees are at risk to the Emerald Ash Borer (see the Tree Diseases page).
* Ash and Hickory are similar with compound leaves, but Ash leaves are opposite and Hickory leaves are alternate.
*A spring rhyme, referring to which leaves appear first; Oak before Ash you get a splash, Ash before Oak you get a soak.

In the Landscape
Black Ash is a small, slow growing tree, up to 20 metres high, and short-lived to less than 100 years.  It has not been commonly used as a landscape tree. On a moist to wet site, Black Ash will develop into a tall, slender tree with pretty compound leaves and corky bark. Today, however, it is risky to plant, due to Emerald Ash Borer, and the fact that is the most susceptible of all Ontario Ashes.

TREE FACT: Black Ash buds are very dark, almost black, leading to the name Black Ash.

Black Ash leaves are compound and opposite, with 7-11 leaflets which are stalkless, with dense patches of hairs where they attach to the main stalk. Leaves turn from yellow to gold in the fall. Black Ash leaves have more calcium, magnesium, nitrogen, and ash than many other trees.
The bark is light gray with corky ridges, without the "diamond" pattern of the other ashes.
Black Ash is polygamous; it can be monoecious and have male, female and perfect flowers on the same tree, or it can be dioecious with male and female flowers on different trees. Flowers are small and darkly coloured, and appear in late spring before or with the leaves. The flowers are wind pollinated. Male trees flower every year but female trees flower every 2 to 5 years
Seeds are samaras (a seed in a papery tissue) which form in summer, and fall off in early autumn.  Seed production occurs after 10 years of growth in intervals of 2 to 7 years.
Black Ash wood is hard and heavy, but less so than the other Ashes. It bends easily so it is used for barrel hoops and other applications where bent wood is needed.
Specific Gravity:
Janka Hardness:
 850 lb
Wood Comparison Chart
Black Ash is diploid. It does not form hybrids.

Link to United States Forest Service Silvics Manual: Black Ash