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European Black Alder

Alnus glutinosa

Non-native (Invasive)

European Black Alder is a deciduous tree that grows in a narrow upright shape to a height of up to 15 meters. It is native to Europe, and was introduced to North America for producing charcoal. In many parts of southern Ontario, European alder is an aggressive weed, displacing native trees. It grows best in wet soils and full sun, thriving in wetlands or in riparian and littoral areas.


Alternate, simple, deciduous; smooth and dark green above, paler and finely hairy beneath; 4-8 cm long


Tiny; male flowers in stalked clusters of hanging, 5-10 cm catkins. Female flowers in small clusters of short-stalked, cone-like catkins


Inner bark reddish; mature bark dark brown, becoming rough


Small, flat nutlets in axils of woody scales in sticky, 1.5-2.5 cm long cones that persist year-round

186 Trees

Heritage Tree

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  • Heritage Tree No. {{property.recognition_number}}
  • Age: {{property.tree_age}} years
  • Height: {{property.tree_height}} metres
  • Circumference: {{property.tree_circumference}} centimetres