Sorbus sitchensis, commonly known as Western Mountain Ash, is a deciduous shrub or small tree native to the cool temperate rainforests, subalpine zones, and mountainous regions of northwestern North America, from Alaska to northern California. It is often found in moist, well-drained, acidic soils along stream banks, forest clearings, and subalpine meadows. Western Mountain Ash typically grows to a height of 13-33 feet (4-10 meters) with a similar spread, and it features compound leaves that turn yellow to red in the fall.

The plant is noted for its clusters of white flowers that bloom in late spring to early summer, followed by bright red-orange berries that persist into winter, providing a striking contrast against the foliage. These berries are a valuable food source for birds and other wildlife. Western Mountain Ash is used in native plant gardens, as a specimen plant, or in naturalized areas. It requires minimal maintenance once established and is relatively free of serious pests and diseases. It thrives in full sun to part shade and prefers moist conditions, though it can adapt to drier sites once established. There are no popular garden cultivars widely available, but the species itself is appreciated for its natural beauty and ecological value.CC BY-SA 4.0