• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Polypodium cambricum 'Cambricum'

Welsh polypody 'Cambricum'

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
Welsh polypody 'Cambricum'

© RHS

  • Other common names Welsh polypody 'Cambricum'

  • Synonyms Polypodium australe 'Cambricum'

  • Family Polypodiaceae

  • Genus Polypodium can be evergreen or deciduous ferns, with creeping rhizomes bearing simple or pinnate fronds at intervals

  • Details 'Cambricum' is a semi-evergreen fern with creeping rhizome, the broadly ovate fronds pinnate with deeply laciniately-toothed pinnae; new fronds appear in late summer

Characteristics

  • Foliage Semi-evergreen

  • Habit Mat forming

  • 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

Sunlight

  • Full Sun

  • Partial Shade

  • Aspect South-facing or West-facing or East-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Loam

    Loam

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilChalk, Loam, Sand

  • pHNeutral, Alkaline

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in moderately fertile, humus-rich, gritty or stoney, well-drained soil in sun or dappled shade. A fern for a neutral to alkaline soil, in a sheltered position

Propagation Propagate by spores at 15-16°C (59-61°F) when ripe. Divide in spring or early summer

Suggested planting locations and garden types Banks and Slopes Flower borders and beds Ground Cover Underplanting of Roses and Shrubs City & Courtyard Gardens Coastal Cottage & Informal Garden Patio & Container Plants

How to care

Pruning Remove fronds as they become untidy

Pests Generally trouble free

Diseases Generally trouble free

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