Swordfern Western Swordfern

You recognize the Western Swordfern by its distinctive stiffly erect, dark green, pinnate fronds (leaflets) with a characteristic small upward-pointing lobe at the base of each leaflet, resembling a sword hilt. The fronds grow 1 to 4 feet tall, leathery and shiny, emerging from a dense crown to create a semi-erect mound. This Pacific Northwest native forms colonies via rhizomatous spread, particularly in moist coniferous woods from Alaska to California and eastward to western Montana. Two varieties exist: var. munitum in moist woods and var. imbricans in drier, rocky sites.

Western Swordfern prefers part shade with moderate moisture; in establishment years (1-2), provide regular watering. Once mature, drought stress is the trigger for supplemental water. The plant tolerates anaerobic and wet soils well but has low drought tolerance, so site selection near consistent moisture sources is ideal. You may observe die-off and miscellaneous disease issues documented in the PNW. Fronds that yellow or brown in fall should not be removed; they protect new growth emerging in spring. Hardy to Zone 4, this evergreen makes an excellent year-round groundcover in woodland edges and shaded borders.