Red Alder (Alnus Rubra) is a tree in the Birch Family (Betulaceae). It’s native to western North America, blooms Mar-Apr and grows 50-90 ft. It’s commonly found in and around wetlands, swamps and forests; tolerates wet to dry soils and partial to full sun exposure.
Red Alder can withstand seasonal flooding and like all Alders is known to fix nitrogen, making it easier for smaller shrubs and forbs to live underneath. It gets the name from the red inner bark used to make red and orange dye. Red Alder is known to form large clusters in moist soils where seedlings germinate, which is troublesome for timber companies wanting a coniferous forest; control methods include herbicide hack-and-squirt and basal applications. Red Alder is very similar to White Alder, both are planted in wetland and stream restoration sites, although Red Alder is planted more because it survives better.