Pinus monticola aka California Mountain Pine

Pinus monticola, or western white pine, is a tall evergreen tree. It belongs to the pine family, Pinaceae. Its home range spans western Canada and the western United States. It grows from British Columbia through the northern Rocky Mountains. Along the Pacific Coast, its range reaches central California. It lives in mountain forests, moist valleys, and dry open sites. Garden references give a mature height near 100 feet [30.5 metres]. Larger trees can reach 180 feet [54.9 metres].

The crown forms a narrow cone, with lower branches spreading sideways. Upper branches may point upward as the tree grows tall. Young bark is thin, smooth, and gray. Older bark forms furrows and scaly plates with roughly square edges. Young stems are reddish brown, then turn gray or purple-brown. Blue-green needles grow in groups of five. They measure about 0.17–0.33 feet [0.05–0.10 metres] long. White stomatal lines mark their inner faces. Their edges bear small teeth.

One tree bears both male and female cones. Small yellow male cones cluster near branch tips. Female cones form on stalks near the upper branch tips. They range from yellow-green to bright pink. NC State places their appearance in June, with pollen release into July. Long seed cones hang alone or in small groups. They ripen in August and September of their second year. Warm weather can make them drip white resin. Each reddish-brown seed has a long wing.

Give this fast-growing pine full sun and moist, acidic soil. Good drainage matters; sandy or gravelly loam suits it. Established trees can cope with drought, but poorly drained sites do not suit them. NC State lists USDA zones 3–7 for cultivation. Large gardens can use the tree as a screen or specimen. Birds and small mammals eat its seeds. Deer and grouse feed on the foliage. The tree also gives wildlife cover and places to nest.

Blister rust is a major threat and can kill the tree. Other problems include pole blight, needle blight, and root fungi. Bark beetles also attack it, and wind can cause damage. The tree has a high fire risk. Its timber supplies building wood, doors, and indoor paneling. Reported food uses include seeds, inner bark, and roasted young cones. People have also chewed its stem gum. Indigenous peoples used its bark in traditional remedies. These records describe past uses, not proof of safe treatment.