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Author:US NPS Santa Monica Mountains National Recreation Area 2
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Alnus rhombifolia - White Alder Seed - Sheffield's Seed Co., Inc.
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Alnus rhombifolia

Sierra Alder, White Alder

In Stock: 0.786 lb (Total:0.786lb)
  • Alnus rhombifolia

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Buying options

0.79 lb


Germination test:
Cut (Full Seed)
Seeds per lb:
0.79 lb
Collected in:
Crop year:
Min. hardiness zone:
Item ID:

Growing Info

Scarification: Soak in water, let stand in water for 24 hours
Stratification: cold stratify for 90 days
Germination: sow seed 1/8" deep , tamp the soil, mulch the seed bed

Alnus rhombifolia, also known as Sierra Alder or White Alder, is a fast-growing deciduous tree that can reach heights of up to 50 ft. Native to western North America, from Washington east to western Montana and south to California, this tree thrives in riparian zone habitats at an altitude range of 300-8000 ft. It is useful for wet spots in West Coast gardens and can fix nitrogen, making it tolerant to infertile soils. With pale gray bark, smooth on young trees, it becomes scaly on old ones, and the leaves are rhombic to narrow elliptic with a finely serrated margin and a rounded to acute apex. Alnus rhombifolia produces catkins for flowers, and the male ones are slender and yellowish, while the female ones are cone-shaped and woody. The fruit is a leathery, irregularly-shaped samara with a small nut. Some Plateau Indian tribes used white alder for female health treatment needs. Although not well-adapted to fire, white alder regenerates from seed and by sprouting after fire, particularly on moist alluvium left bare from receding floodwaters and on moist mineral soils exposed by fire.

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