White Alder (Alnus rhombifolia)

White Alder

White Alder (*Alnus rhombifolia*) is a deciduous tree that can grow to be 15 to 24 m tall. It has pale gray bark that turns scaly as the tree ages. White Alder male flowers are pendulous catkins that are yellowish to brown. Female catkins are smaller, oval-shaped and bloom in summer and fall. This species has small winged seeds that disperse during winter. It attracts butterflies and birds and grows best in full sunlight.

Scientific classification

Species

White Alder (Alnus rhombifolia)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

Tree

Plant Type

Spring, Fall

Bloom Time

15 m to 23 m

Plant Height

9 m to 12 m

Spread

Green

Leaf Color

Spring, Summer

Growth Season

Rapid

Growth Rate

Images of White Alder

Attributes of White Alder

Growth Rate

In Spring and Summer, white Alder exhibits a rapid growth rate, quickly gaining height and producing abundant, diamond-shaped leaves. This accelerated speed enhances leaf turnover and expedites maturity, yielding flowers by mid-Summer. While growth varies seasonally, white Alder's vigorous Spring-Summer expansion is pronounced, supporting swift ecological succession.

Distribution of White Alder

Distribution Map

White Alder is natively found in the major regions of North America and has spread beyond its original range through cultivation. While its growth is primarily concentrated in temperate zones, the plant has adapted to various other climates through intentional cultivation efforts, thus expanding its presence in similar habitats across other regions.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Stream banks, mostly below 5000 ft

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for White Alder

Every 3 weeks

Water

Full sun

Sunlight

0 - 35 ℃

Ideal Temperature

Water: White Alder, native to California's riparian zones, thrives in well-drained soils and requires consistent hydration, ideally watered every three weeks. It exhibits resilience to seasonal water fluctuations and conserves water during dormancy by shedding leaves to minimize transpiration.

Fertilize: For optimal growth of white Alder, use balanced, slow-release fertilizers every 6-8 weeks during the growing season, applying moderate amounts. Water white Alder before fertilization, spread evenly at the drip line, and avoid the trunk to prevent damage. Adjust fertilization frequency during dormancy.

Pruning: White Alder features smooth bark and serrated leaves. Prune in early spring to remove dead or crossing branches, promoting healthy growth and air circulation. Thinning enhances form and longevity while reducing disease risk. Avoid heavy pruning to prevent stress. Consult horticultural guides for more details.

Propagation: White Alder is a deciduous tree from the Betulaceae family, easily cultivated. For propagation, collect mature seeds and plant in a well-draining medium, ensuring consistent indirect light and moisture without waterlogging. Proper care promotes successful germination, leading to a thriving new generation of robust trees.

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