Western White Pine

Western white pine is a native conifer of montane and subalpine forests throughout the Cascade Range and mountains of Western Washington, a stately tree that reaches 100+ feet in its native high-elevation habitat. The bark is smooth and greenish-gray on young trees, becoming gray and furrowed with age. The needles are bundled in fives (a key distinguishing feature), are slender and blue-green, and persist for several years. The cones are large (5-8 inches), narrow, and cylindrical, with thin, papery scales. The tree is shade-tolerant and often grows as an understory species beneath Douglas-fir in mixed conifer forests. In managed landscapes, especially at lower elevations in Western Washington, the tree grows well and reaches 60-80 feet.

In Western Washington lowlands and foothill areas, western white pine is an excellent alternative to limber pine or bristlecone pine for conifer diversity. The tree grows steadily in part shade to full sun with well-drained soils and moderate moisture. The greatest threat is white pine blister rust (Cronartium ribicola), a non-native fungal disease that has killed millions of western white pines across its native range. The fungus requires an intermediate host (Ribes species, currants and gooseberries), so rust-resistant selections bred for low-Ribes sites may be available. Check before purchasing to ensure nursery stock is from rust-resistant provenance. The tree's slow to moderate growth, elegant columnar form, and fine-textured foliage make it a valuable landscape choice if disease can be managed. For restoration plantings in foothill areas, western white pine is increasingly favored over eastern white pine because of superior adaptability to drier summers and lower disease pressure from blister rust than some eastern provenances.