Alnus rubra, Red Alder, Pacific Northwest Native Plants, Oregon Native Tree, Sparrowhawk Native Plants, Portland
Alnus rubra, Red Alder, Pacific Northwest Native Plants, Oregon Native Tree, Sparrowhawk Native Plants, Portland
Alnus rubra, Red Alder, Pacific Northwest Native Plants, Oregon Native Tree, Sparrowhawk Native Plants, Portland

Red Alder

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Alnus rubra

  • Size at maturity: 80-100' tall, 30-40' wide
  • Canopy layer: large tree
  • Light requirements: full sun, part-sun/part-shade
  • Moisture requirements: wet to dry soil
  • Growth rate: very fast
  • Special features: medicinal, wildlife favorite

In areas where fire or logging has destroyed Douglas fir forests, Red Alder often colonizes in vigorous stands. Frequently flooded landscapes are also a favorite habitat for Red Alder. Since Red Alder cannot grow in deep shade, conifers usually replace the alders in time. Red alders have a smooth, gray bark that is often covered by large patches of a white lichen. (Portland Plant List, 2016)

Photo Credit 1: Tara Lemezis

Photo Credit 2: "Alnus rubra (Red alder) near Chenuis Falls Trail" by brewbooks is licensed under CC BY-SA 2.0

Photo Credit 3: "Red Alder (Alnus rubra) stand" by Holy Outlaw is licensed under CC BY-ND 2.0