Fraxinus quadrangulate
Blue Ash is listed as “threatened” in Ontario and Canada under the Endangered Species Act, mainly as a result of forest clearing and habitat loss. The invasive Emerald Ash Borer is also a threat to this species, however there is some evidence that suggests that Blue Ash is at a lower risk for infestation compared to other Ash species. The tree can grow up to 20m in height and live to be approximately 150 years old. Blue Ash is very easy to distinguish from other Ash species, as Blue Ash twigs are square with 4 distinct sides or ridges. The leaves of Blue Ash are arranged opposite on the stem and are compound, with 5-11 leaflets. The seed is enclosed in a twisted, winged samara and is a food source for some birds and small mammals.
Blue Ash prefers to grow in full sun, but can also adapt to part shade growing conditions. It is very adaptable to many different soil types and will grow in dry to moist soil types. It is considered to be the most drought resistant species of native Ash tree.
