Polystichum munitum

Polystichum munitum (Western Sword Fern) is an evergreen fern native to western North America, where it is one of the most abundant ferns occurring along the Pacific coast from southeast Alaska south to southern California, and also inland east to southeastern British Columbia, northern Idaho and western Montana, with isolated populations in interior northern British Columbia, the Black Hills in South Dakota, and on Guadalupe Island off Baja California.

The dark green fronds of this fern grow several feet long at maturity, in a tight clump spreading out radially from a round base. They provide year-round wildlife shelter and visual interest, especially when paired with woodland companions such as Oregon oxalis, inside-out flower, wild ginger, deer fern, etc.

Their preferred habitat is the understory of moist coniferous forests at low elevations. They grow best in a well-drained acidic soil of rich humus and small stones, but can tolerate some clay. Sword ferns are very tough, and can survive occasional dry periods once established. They prefer shade but can tolerate some sun. Their thick root systems and broad spreading fronds make them excellent plants for erosion control.

In favorable conditions, sword ferns produces lush vegetation, and a thick layer of past years’ fronds will accumulate beneath. This material provides winter shelter for wildlife and creates a natural mulch, but these plants tolerate mild pruning to remove dead standing stalks. They also tolerate an occasional full winter pruning to encourage fresh new growth.