Polypodium interjectum 'Cornubiense'

RHS Plant Profile

hybrid polypody 'Cornubiense'

RHS

Other common names

Cornish polypody

Synonyms

Polypodium interjectum 'Cornubiense'
Polypodium vulgare 'Cornubiense'

Ferns

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A vigorous, evergreen fern with a creeping rhizome bearing broadly ovate, bipinnatifid fronds with lobed segments, mixed with occasional simply pinnate ones

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Loam Sand

Moisture: Moist but well–drained
pH: Alkaline or Neutral

Position

Full sun Partial shade

Aspect: North–facing or West–facing or South–facing or East–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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Polypodiaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Matforming
Genus: Polypodium can be evergreen or deciduous ferns, with creeping rhizomes bearing simple or pinnate fronds at intervals
Name Status: Accepted

How to Grow

Cultivation

Easy to grow in most cool, moist, lightly shaded sites and will grow in full sun if given plenty of moisture. Tolerant of dry shade but water regularly in their first season and mulch well. See how to grow ferns for further advice

Propagation

Propagate by division in spring or early summer

Suggested planting locations and garden types

Rock garden
City and courtyard gardens
Cottage and informal garden
Banks and slopes
Flower borders and beds
Underplanting of roses and shrubs
Ground cover

Pruning

Dead or damaged fronds may be removed as necessary

Pests

Generally pest-free outdoors

Diseases

Generally disease-free outdoors