SelecTree: Tree Detail

WHITE ALDER
Alnus rhombifolia

Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia Alnus rhombifolia

Photo Locations: Tilden Regional Parks Botanical Garden - Berkeley, CA, 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

General Notes

Relatively tolerant of heat and wind in landscaped areas.

Native to California, Western North America from the Sierra Nevada to Montana.

An Alnus rhombifolia in Devil's Punchbowl is registered as a California Big Tree. It measures 94 feet high, with a trunk circumference of 127 inches and a crown spread of 46 feet.

Family: Betulaceae

Tree Characteristics

Erect or Spreading and requires ample growing space.

Conical Shape.

Has Deciduous foliage.

Height: 50 - 90 feet.

Width: 40 - 70 feet.

Growth Rate: 36 or More Inches per Year.

Longevity 40 to 150 years.

Leaves Rhomboidal, Medium to Dark Green, Bronze or No Change, Deciduous.

Flowers Inconspicuous. Green or Yellow. Flowers in Spring. Has separate male and female flowers on the same tree (monoecious).

Prolific, Brown or Orange Cone, Medium (0.50 - 1.50 inches), fruiting in Fall, Winter or Summer.

Bark Light Gray, Fissured.

Shading Capacity Rated as Dense in Leaf.

Shading Capacity Rated as Moderate to Dense out of Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 1 - 10 and 14 - 21.

USDA Hardiness Zones 8 - 11.

Exposure Full Sun to Partial Shade.

Wet to Moist Soil.

Clay, Loam or Sand Texture.

Highly Acidic to Slightly Alkaline Soil pH.

Seaside Tolerance is Good in Mild Zone.

Pests & Disease Information

Susceptible to Aphids, Beetle Borers, Caterpillars and Spider Mites, Armillaria and Powdery Mildew.

Health, Safety & Environmental Concerns

Branch Strength Rated as Medium.

Root Damage Potential Rated as High.

Allergy Health Hazard.

Fire Resistance is Favorable.

Desirable Wildlife Plant.

Attracts Birds.

Deer Palatable.

Special Uses & Values

Riparian.

Cite this tree:
SelecTree. "Alnus rhombifolia Tree Record." 1995-2018. Jun 23, 2018.
< https://selectree.calpoly.edu/tree-detail/alnus-rhombifolia >

SelecTree Nursery Connection Map
Cal Poly / ESRI