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Ferns

Polystichum tsussimense 'K Rex'

An evergreen, clump-forming fern with erect, narrowly lance-shaped, bipinnate fronds, with slender-pointed apex and leaflets. This cultivar has fronds almost twice the size of the species.

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Ultimate height

0.5–1 metres

Time to ultimate height

5–10 years

Ultimate spread

0.5–1 metres

Loam

Clay

Chalk

Sand

Moisture

Moist but well–drained

pH

Neutral, Acid, Alkaline

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full shade
Partial shade

Aspect

West–facing or East–facing or North–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Dryopteridaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Clump forming
Genus: Polystichum are mostly evergreen or semi-evergreen ferns, with short stout rhizomes and pinnately divided fronds in neat shuttlecock-like rosettes
Name status: Unresolved

How to grow

Cultivation

Easy to grow in most cool, fertile, moist, humus-rich, shaded soils. Protect crowns from excessive winter wet. See how to grow ferns

Propagation

Propagate by division

Suggested planting locations and garden types

Cottage and informal garden
Low Maintenance
Flower borders and beds
Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free

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