Polystichum luctuosum – Korean rock fern with glossy dark fronds


Polystichum luctuosum (Kunze) T.Moore, also known as the Korean rock fern or Tsushima holly fern, is a compact, tufted species prized for its glossy evergreen foliage. Native to forested slopes, rocky ground, and stream banks across China, Japan, Korea, Vietnam, and Thailand, it forms neat clumps of shuttlecock-like fronds that bring refined texture to shaded gardens or containers.
 
● Key Features


Foliage: Lance-shaped, finely divided, bipinnate fronds in deep glossy green with contrasting black veins.
Growth habit: Clump-forming rosettes reaching around 35 cm tall and wide.
Pinnae detail: 15 – 20 pairs of narrow- to oblong-ovate leaflets with subtly spiny margins.
Year-round appeal: Evergreen to semi-evergreen, maintaining structure through much of the year.
Awarded: RHS Award of Garden Merit (1997).
 
● Natural Habitat


This fern thrives in shaded woodland settings and along stream margins, where moisture and dappled light create the perfect conditions. Its natural resilience makes it well adapted to a variety of shaded garden environments.
 
● Growing and Care Guide


Light: Prefers partial to full shade; avoid direct, hot sun.
Soil: Moist, humus-rich, well-drained soils mimic its native forest floor conditions.
Watering: Keep soil consistently moist, particularly in summer; do not allow to fully dry out.
Hardiness: Cold-tolerant; semi-evergreen in colder climates, evergreen in milder areas.
Maintenance: Remove old fronds in spring to encourage fresh growth.
 
● Common Issues


Frond browning: Often caused by drought or excessive sun exposure.
Slow growth: Improve soil organic content and provide consistent moisture.
Winter dieback: Semi-evergreen in colder areas; new growth will re-emerge in spring.
 
● Etymology


The genus name Polystichum comes from the Greek polys (“many”) and stichos (“in a row”), referring to the rows of sori (spore cases) on the undersides of the fronds. The species epithet luctuosum means “mournful” in Latin, though its exact reference is uncertain.
 
● Synonyms


Previously described as Aspidium tsus-simense and Polystichum tsus-simense, still occasionally seen under these names in horticulture.
 
● Add Polystichum luctuosum to Your Collection


Compact, evergreen, and elegant, the Korean rock fern is perfect for shaded borders, woodland gardens, or containers. Order Polystichum luctuosum today and enjoy year-round foliage with award-winning reliability.