Tsushima Holly Fern (Polystichum tsus-simense): Compact, Rock-Loving Holly Fern

Overview

Tsushima holly fern (Polystichum tsus-simense), also called Tsus-sima holly fern or Korean rock fern, is a **compact, evergreen fern** native to Japan, Korea, and China. Its **stiff, upright, once-pinnate fronds** (8–16 inches) bear leathery, glossy, dark green pinnae with spiny-toothed margins—resembling miniature holly leaves. It forms a tight, symmetrical clump, ideal for rock gardens, troughs, and small shaded spaces.

Rock Garden Perfection

• Compact Symmetry: Neat, rounded form suits small spaces.
• Rock Adaptation: Thrives in crevices and well-drained slopes.
• Evergreen Detail: Spiny pinnae provide winter texture.

Culture

Partial to full shade; moist, well-drained, humus-rich soil. Excellent drainage critical. Hardy USDA zones 6–9. Perfect for shaded rock gardens, alpine troughs, and container edges.

Taxonomic Profile

Small, spiny, and perfectly proportioned—Tsushima holly fern is a rock garden jewel.