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Hansen's Northwest Native Plant Database |
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Hansen's Northwest Native Plant Database |
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Alnus rubra (Red
Alder)
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An attractive, fast growing tree, Red Alder attains heights of 75. A coastal tree, it grows no more than 100 miles inland, from southern Alaska to California in USDA zones 7-10. They are found growing on poor, moist soils and on steep slopes, where they prevent erosion. The bark is gray and the leaves remain a vibrant green until they drop. Red Alder has many medicinal qualities and is also used as a dye plant. It is the most important commercial hardwood in the Pacific northwest. The roots of Red Alder fix nitrogen at rates of 40-300 lbs per acre, (compared to 105 lbs per acre for soybeans). This is an outstanding species for reclaiming bare land. Red Alder can tolerate some drought and thrives in brackish wetlands. It transplants well. |
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 Left, Photo Credit: Bureau of Land Management; Center Photo Credit: Pat Temple, US Forest Service, http://earthobservatory.nasa.gov/Library/OzoneWx showing ozone discolouration; Photo Credit: WalterSiegmund |
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Left, Photo Credit: Walter Siegmund at Nisqually National Wildlife Refuge, broken branch showing red weathered bark; Right Photo Credit: Walter Siegmund, Red Alder stump. "This c.20 year old individual was about 0.2 m in diameter." |
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 Left, Photo Credit: Bureau of Land Management; Center and Right Photos Credit: WalterSiegmund |
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 Bark on tree at Cougar Mountain Regional Wildland Park; Snag at Squaw Mountain State Park Photos Credit: Walter Siegmund |
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