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Photo Credits:
M. Ritter, W. Mark and J. Reimer

Photo Locations:
Rancho Santa Ana Botanic Garden - Claremont, CA and Cal Poly Campus - San Luis Obispo, CA, Santa Cruz, CA and Los Angeles County Arboretum - Arcadia, CA

WHITE ALDER
Alnus rhombifolia

General Notes

     Relatively tolerant of heat and wind in landscaped areas. Native to Western North America from the Sierra Nevada to Montana.
     An Alnus rhombifolia in Springville (SCICON) is registered as a California Big Tree. It measures 75 feet high, with a trunk circumference of 111 inches and a crown spread of 36 feet.
  List all Betulaceae | Alnus

• Alnus rhombifolia - Betulaceae
• Native To: Western North America from the Sierra Nevada to Montana
• Habit: Erect or Spreading and covers an Extensive Area.
  Has Deciduous foliage.
• Shape: Conical
• Sunset Zones: 1 - 10 and 14 - 21
• USDA Hardiness Zones: 8 - 11
• Exposure: Full Sun to Partial Shade
• Water Needs: Wet to Moist Soil
• Soil Type: Clay, Loam or Sand
• Soil pH: Highly Acidic to Slightly Alkaline
• Seaside Tolerance: Good in Mild Zone
• Height: 50 - 90 feet
• Canopy Width: 40 - 70 feet
• Growth Rate: Over 36 Inches per Season
• Landscape Use: Riparian
• Longevity: 40 to 150 years
• Leaves: Rhomboidal Medium to Dark Green. Bronze or No Change in Fall. Deciduous.
• Flowers: Inconspicuous, Green or Yellow. Flowers in Spring. Has separate male and female flowers on the same tree (monoecious).
• Cone: Prolific, Brown or Orange Medium (0.50 - 1.50 inches), fruiting in Fall, Winter or Summer.
• Bark: Light Gray, Furrowed
• Pest & Disease: Susceptible to Aphids, Beetle Borers, Caterpillars and Spider Mites, Powdery Mildew More information …
• Shading Capacity: Rated as Dense in Leaf and Moderate to Dense out of Leaf.
• Branch Strength: Rated as Medium
• Litter Issue: Dry Fruit
• Root Damage Potential: Rated as High
• Health Hazard: Allergy
• Fire Resistance: Favorable

Cite This Page:
SelecTree. "Alnus rhombifolia Tree Record." 1995-2012. May 19, 2013.
< http://selectree.calpoly.edu/treedetail.lasso?rid=154 >