Polypodium cambricum 'Whilharris'

RHS Plant Profile
Welsh polypody 'Whilharris'

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Synonyms

Polypodium australe 'Cambricum Wilharris'

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Ferns
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A clump-forming, semi-evergreen to evergreen fern with narrow, oblong fronds and twisted pinnules (leaflets) with acutely pointed tips

Position

Partial shade

Soil Types

Loam, Chalk

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Loam Chalk
Moisture
Moist but well–drained
pH
Neutral or Alkaline

Position

Partial shade
Aspect
West–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, Semi evergreen
Habit
Clump forming
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

Grow in moderately fertile, humus-rich, neutral to alkaline, well-drained soil in light shade. Shelter from cold, drying winds. See how to grow ferns for further advice

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
  • Wall side borders

Pruning

No pruning required, but old or faded fronds can be removed if necessary

Pests

Generally pest-free

Diseases

Generally disease-free