Red Alder - Sierra Club BC
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Red Alder

CAN BE FOUND IN:

Red Alder

Alnus rubra 

APPEARANCE

The red alder grows to 24 metres tall and is often found in recently disturbed areas, especially along marshes, floodplains and stream banks. The flowers can be male or female and are called “catkins”. The leaves are bright green, oval and toothed along the edge. The bark of the tree grows rough with age, and turns orange-red if opened to the air. 

RANGE & HABITAT 

The red alder is found along the entire coast of B.C., and much of the Interior.

RECIPROCAL RELATIONSHIPS 

The red alder is a vital tree in many B.C. ecosystems. The red alder is a fast-growing tree, that lives 40 to 60 years, and pops up in recently cleared secondary stand forests. Because of its symbiotic relationship with Frankia (nitrogen-fixing bacteria), the red alder can fix its own nitrogen. This makes it an important species for restoring soil nutrients. Since they sprout after disturbance, these plants also help to stabilize soil thus preventing soil erosion! 

Red alder leaves are eaten by some animals, although it is not an important part of the diet of any particular animals. Young alder shoots provide important shelter for small animals and birds. The larger mature trees have a broader canopy that provides warmth for some larger animals.  

Coastal First Nations would use the red alder for a variety of purposes, including for food, medicine, and as woodworking materials. Food and medicine would be retrieved from the inner bark in spring, used to treat symptoms of tuberculosis, stomach ailments, and infections. 

Status

COSEWIC: Not Reported 
CDC: Yellow 

More Information

If you belong to a First Nation with a story or piece of information not represented here and you would like to share more about this species, please email us at education@sierraclub.bc.ca

Photo Credit

Gertjan van Noord (CC BY-ND 2.0)

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