Polystichum tsussimense Korean rock fern
size/type
low perennial,low perennial
usual height
0,3-0,4m
usual width
0,3-0,4m
leaves
evergreen broadleaf
colour of leaves
location
semi-shade to shade
USDA zone (lowest)
5b (down to -27°C)
winter protection
for zone 5+6
for zone 7
categorized
Description of the plant:
Korean rock fern is an East Asia species with glossy, evergreen foliage. It forms small, compact shuttlecocks of 20-40 cm long, pinnate fronds which might have been bi-pinnate if only the pinnae had not been joined at the base into one, deeply lobed, lanceolate, abruptly pointed segment. They are erect, rich green with lighter green new growths. It prefers a semi-shaded location or deep shade. Soil has to be evenly moist but well-drained and rich in organic matter. It does not care about soil pH. Keep it mulched all year round and feed it once or twice during the growing season with a slow-release fertilizer for evergreen plants.
It is commonly rated hardy to -23 °C (USDA zone 6) which seems to refer to foliage hardiness. Though it is allegedly root-hardy to almost -29 °C (USDA zone 5). In spring remove all withered and unsightly foliage to encourage formation of new, healthy leaves.
Last update: 03-12-2020
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