Polystichum tsussimense

Polystichum tsussimense
Korean rock fern

SIZE/TYPE	low perennial
USUAL HEIGHT	0.3-0.4m
USUAL WIDTH	0.3-0.4m
LEAVES	evergreen broadleaf
COLOUR OF LEAVES	green
LOCATION	semi-shade to shade
USDA zone (lowest)	5b (down to -27°C)
WINTER PROTECTION
FOR ZONE 5+6
FOR ZONE 7
BELONGS TO CATEGORIES	Ferns Evergreen broadleaf Perennials

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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GLOSSARY

STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
SHRUB - a woody plant with branches growing bushy from the ground level.
HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.