European Alder
Alnus glutinosa

Also called Black Alder, this tree is tall and narrow, often with multiple trunks that develop shallow vertical cracks as the tree ages. A sticky resin coating the leaves, twigs and buds provides the species name, “glutinosa.” Its cone-like catkins slowly release seeds through winter, making them a valuable food source for wildlife.

Habitat:Requires moderate moisture.
Growth Habit:Deciduous tree, with rapid growth to 21 m tall, can spread 6-12 m.
Bloom Time:Early spring.
Longevity:Moderate.
Presence in US:AL CT DE IA IL IN KS KY MA MI MN MO NJ NY OH PA TN VA VT WI WV
Presence in Canada:NS ON
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This project was supported in part by NSF Grant IIS-03-25867 (ITR: An Electronic Field Guide: Plant Exploration and Discovery in the 21st Century) and by the Washington Biologists' Field Club.
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