Polypodium cambricum (Semilacerum Group) 'Falcatum O'Kelly'

RHS Plant Profile
Welsh polypody 'Falcatum O'Kelly'

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A deciduous terrestrial fern, to 50cm tall, with creeping rhizomes and lance-shaped to oblong, pinnate or very deeply divided mid-green fronds, with sickle-shaped pinnae, appearing in late summer and dying back in spring

Position

Full sun, Partial shade

Soil Types

Loam, Sand, 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 Sand Chalk
Moisture
Well–drained
pH
Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or West–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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Polypodiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Polypodium can be evergreen or deciduous ferns, with creeping rhizomes bearing simple or pinnate fronds at intervals
Name Status
Unresolved

How to Grow

Cultivation

Easy to grow in moderately fertile, gritty or stony, neutral to alkaline, well-drained soil in sunny or lightly-shaded sites with shelter from cold winds. See how to grow ferns for further advice

Propagation

Propagate by division in spring or early summer. Sow spores at 15-16°C when ripe

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds
  • Ground cover
  • Underplanting of roses and shrubs

Pruning

Dead or damaged fronds may be removed as necessary

Pests

Generally pest-free

Diseases

Generally disease-free