Blue Ash

About Blue Ash in Alberta

Blue Ash is a distinctive eastern North American ash recognized by its square, four-ridged twigs and compound leaves. In Canada its verified wild range is southwestern Ontario, and no strong Alberta-local planted record is confirmed here. For ARA, Blue Ash should be treated as a foreign species and possible but unverified cultivated rarity in Alberta; any Alberta record would need careful confirmation before being interpreted as a meaningful heritage specimen.

Identification: Leaves are opposite and pinnately compound, usually with 5-11 leaflets and often 7. Leaflets are coarsely serrated, short-stalked, dark green above, and paler beneath.

Alberta range and habitat: Blue Ash is not a native Alberta tree. In Canada, its verified wild range is southwestern Ontario.