Western Sword Fern (Polystichum munitum): Iconic Evergreen Fern of the Pacific Northwest

Overview

Western sword fern (Polystichum munitum) is the signature evergreen fern of Pacific Northwest forests. Its stiff, upright, once-pinnate fronds (2–4 feet) form a striking, shuttlecock-shaped clump that persists year-round. The pinnae have a distinctive "sword hilt" shape—lobed at the base with a forward-pointing tooth. Tough, long-lived, and adaptable, it's the backbone of countless shade gardens from California to Alaska.

Why It's Essential

• Evergreen Structure: Reliable winter presence.
• Extreme Durability: Tolerates drought, root competition, and deep shade once established.
• Native Ecological Value: Provides habitat and food for wildlife.

Culture

Partial to deep shade; well-drained, humus-rich soil. Drought tolerant after establishment. Low maintenance—remove tattered fronds in spring. Hardy USDA zones 5–9.

Taxonomic Profile

Majestic, enduring, and quintessentially northwestern—the western sword fern defines regional shade gardening.