Polystichum tsus-simense

Korean rock fern

  • © Richie Steffen / Great Plant Picks

Outstanding Qualities

Often sold as an indoor houseplant this beautiful and useful fern is quite hardy in our climate (to USDA zone 6). Korean rock fern is a charming, small, evergreen fern with a neat appearance. Each frond is delicately laced with black veins that accentuate its rich, dark green leaves. It is a slow grower, only reaching about 12 inches tall and gradually forming a small clump. The fronds are held very upright and are finely divided, creating an eye-catching yet refined look. This is a must for any shady rockery and can be useful and long-lived as a container plant. Combine Korean rock fern with pale greens or variegated plants to make the dark foliage stand out in the shade. It's a great choice for small spaces.

Quick Facts

Plant Type: fern

Foliage Type: evergreen

Plant Height: 1 ft. 0 in. (0.30 meters)

Plant Width/Spread: 1 ft. 0 in. (0.30 meters)

Hardiness: USDA Zones 6 to 9

Flower Color: none

Sun/Light Exposure: light to deep shade

Water Requirements: regular watering

Colors & Combos

Great Color Contrasts: silver, gold, blue

Great Color Partners: variegated, chartreuse

Culture Notes
This fern grows best in rich moist to well-drained soil, but will tolerate sand or clay. Provide regular watering during dry weather to keep the fronds from drying out. This fern grows well in light to deep shade. Though it is evergreen the fronds should be cut down in late February or March, before the new fronds emerge.