SelecTree: Tree Detail

ITALIAN ALDER
Alnus cordata

Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata Alnus cordata

Photo Locations: Cal Poly State University - San Luis Obispo, CA, Hoyt Arboretum - Portland, OR and Los Angeles County Arboretum - Arcadia, CA

General Notes

Borers are serious problem on most alders. Roots are invasive. Grows best with regular, deep irrigation.

Native to Italy, Corsica.

Family: Betulaceae

Tree Characteristics

Erect or Spreading with a High Canopy.

Oval or Rounded Shape.

Has Deciduous foliage.

Height: 40 - 50 feet.

Width: 25 feet.

Growth Rate: 36 or More Inches per Year.

Longevity 40 to 150 years.

Leaves Cordate, 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 Cone, Medium (0.50 - 1.50 inches), fruiting in Winter Wildlife use it.

Bark Light Gray, Furrowed or Smooth.

Shading Capacity Rated as Dense in Leaf.

Shading Capacity Rated as Dense out of Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 2 - 9 and 14 - 24.

USDA Hardiness Zones 5 - 7.

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

Resistant to Borer. Susceptible to Beetle Borers, Powdery Mildew.

Health, Safety & Environmental Concerns

Branch Strength Rated as Medium.

Root Damage Potential Rated as Moderate.

Allergy Health Hazard.

Fire Resistance is Favorable.

Desirable Wildlife Plant.

Attracts Birds.

Deer Palatable.

Wildlife use Fruit.

Special Uses & Values

Riparian or Street Tree.

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

SelecTree Nursery Connection Map
Cal Poly / ESRI