SelecTree: Tree Detail
Photo Locations: Hoyt Arboretum - Portland, OR, Finch Arboretum - Spokane, WA and Arnold Arboretum - Boston, MA.
A tall timber species (150 - 200 feet) when groing in its native range, but usually much shorter in landscapes.
Native to Northwestern United States.
Additional Common Names
WESTERN LARCH, TAMARACK
Erect and requires ample growing space.
Has Deciduous foliage.
Height: 30 - 50 feet.
Width: 10 - 15 feet.
Growth Rate: 24 Inches per Year.
Longevity Greater than 150 years.
Leaves Needle, Bluish Green or Silver or Gray Green, Golden or Yellow or Orange, Deciduous.
Flowers in Spring. Has separate male and female reproductive parts on the same tree (monoecious).
Purple or Red Cone, Medium (0.50 - 1.50 inches), fruiting in Summer.
Bark Red Brown, Furrowed or Scaly.
Shading Capacity Rated as Moderately Dense in Leaf.
Shading Capacity Rated as Moderate out of Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 1 - 7; A3.
USDA Hardiness Zones 4 - 8.
Exposure Full Sun to Partial Shade.
Clay, Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Seaside Tolerance is Not Suited.
Pests & Disease Information
Susceptible to Beetle Borers and Beetle Grubs, Armillaria, Root Rot and Rust.
Health, Safety & Environmental Concerns
Branch Strength Rated as Strong.
Root Damage Potential Rated as Moderate.
Allergy Health Hazard.
Fire Resistance is Unfavorable.
Desirable Wildlife Plant.
Cite this tree:
SelecTree. "Larix occidentalis Tree Record." 1995-2020. Aug 14, 2020.
< https://selectree.calpoly.edu/tree-detail/larix-occidentalis >