Blechnum discolor

RHS Plant Profile
crown fern

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Ferns Herbaceous Perennial
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An evergreen fern with bright green, upright, fertile fronds with paler undersides, surounded by green, arching, sterile fronds. Mature plants can develop a short trunk-like rhizome structure.

Position

Full shade, Partial shade

Soil Types

Loam, Clay, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
5–10 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Loam Clay Sand
Moisture
Moist but well–drained or Well–drained
pH
Neutral or Acid

Position

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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Blechnaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Genus
Blechnum are mostly evergreen ferns with erect or creeping rhizomes and simply pinnate, leathery fronds, the fertile ones usually erect, the sterile often spreading
Name Status
Correct
Plant Range
New Zealand

How to Grow

Cultivation

For best results grow in moist but free draining soil in partial shade. For more information see our advice page how to grow ferns.

Propagation

Propagate by division or spores

Suggested planting locations and garden types

  • Patio and container plants
  • Cottage and informal garden
  • Low Maintenance
  • Underplanting of roses and shrubs
  • Flower borders and beds

Pruning

Generally not required but can remove dead or damaged fronds as required.

Pests

Generally pest-free

Diseases

Generally disease-free