Alnus rhombifolia, California Big Tree
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White Alder, California Big Tree
A member of the birch family native to California. A deciduous tree with a conical shape that grows to about 95 feet. This tree grows about 36 inches per year. This plant produces a pollen that can produce an allergic reaction.
These trees should be pruned in winter. Young trees require a little pruning to establish a single trunk. The lower branches that die on mature trees should be removed.
Plant with: Wetland-riparian trees and plants including Maples (Acer species), Dogwood (Cornus species), Ash (Fraxinus species), Walnut (Juglans species), Western Sycamore (Platanus racemosa), Cottonwood (Populus species), Willow (Salix species), Spicebush (Calycanthus occidentalis), Wild Honeysuckle (Lonicera species), Wild Azalea (Rhododendron species), Wild Currant (Ribes species), Wild Rose (Rosa species), and Wild Grape (Vitis species)
- Plant in full sun to light shade
- Clay, loam, or sand texture, tolerates no drainage
- Highly Acidic to Slightly Alkaline Soil pH
- Wet to moist soil
- Susceptible to Aphids, Beetle Borers, Caterpillars and Spider Mites, Armillaria and Powdery Mildew
- Nitrogen fixing plant
- Attracts birds and butterflies
- American Goldfinch, Mourning Dove, Yellow Warbler, Song Sparrow, and Purple Finch, Red-breasted Sapsucker drills for sap, Pine Siskin eats seeds, Cedar Waxwing eats flowers, Kinglets, warblers, bushtits, and vireos forage for insects in the foliage
-Native to California