White Alder

(Alnus rhombifolia)

White Alder (Alnus rhombifolia)

/

return to results
Previous Plant Next Plant

/

Alnus rhombifolia image
scroll forward scroll backward
scroll forward scroll backward
Estimated Native Range
Species Map Help

Summary

Alnus rhombifolia, commonly known as White Alder, is a deciduous tree native to riparian zones of the western United States, particularly California and Oregon, where it thrives along streams and rivers. It can grow to a height of 50-90 feet and a width of 40-70 feet. White Alder is typically found in moist environments within chaparral, woodlands, and montane regions, as well as temperate forests at altitudes ranging from 100–2,400 meters (330–7,870 ft). Its presence in northern Baja California, while not officially reported, is plausible given its climatic preferences.

White Alder is notable for its rapid growth and adaptability to wet conditions. It features a straight trunk with smooth, light gray bark and a broad, rounded crown. The tree produces catkins which are not particularly showy, but its ability to stabilize streambanks and improve soil fertility through nitrogen fixation makes it valuable for restoration projects. It is often used in riparian restoration, as a shade tree in large landscapes, and for erosion control. White Alder requires abundant water and does well in full sun or partial shade, preferring soils with good drainage. It is relatively low-maintenance but can be susceptible to various diseases, including Phytophthora. Gardeners should be aware of its potential to spread if conditions allow.CC BY-SA 4.0

Plant Description

  • Plant Type: Tree
  • Height: 50-90 feet
  • Width: 30-50 feet
  • Growth Rate: Rapid
  • Flower Color: N/A
  • Flowering Season: Summer, Fall
  • Leaf Retention: Deciduous

Growth Requirements

  • Sun: Full Sun
  • Water: High
  • Drainage: Fast, Medium

Common Uses

Bee Garden, Bird Garden, Butterfly Garden, Edible*Disclaimer: Easyscape's listed plant edibility is for informational use. Always verify the safety and proper identification of any plant before consumption., Erosion Control, Low Maintenance, Rabbit Resistant, Water Garden

Natural Habitat

Riparian zones of the western United States, particularly along streams and rivers in California and Oregon

Other Names

Common Names: Mountain Alder , California Alder , Rhombie Leaf Alder

Scientific Names: Alnus rhombifolia , Alnus rhombifolia var. bernardina , Alnus rhombifolia var. ovalis , Alnus californica , Alnus rhombifolia var. bernardiana , Alnus rhombifolia var. typica

GBIF Accepted Name: Alnus rhombifolia Nutt.