Doodia media

RHS Plant Profile
common rasp-fern

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common rasp-fern RHS

Synonyms

Blechnum medium

Ferns Conservatory Greenhouse
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An evergreen fern with sword-shaped fronds bearing dark green, leathery segments along a brown midrib

Position

Partial shade

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
5–10 years
Max Spread
0.5-1 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam
Moisture
Moist but well–drained
pH
Acid

Position

Partial shade
Aspect
North–facing or East–facing or West–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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Blechnaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Tufted
Genus
A genus of reasonably hardy evergreen ferns, native to the Himalayas and Japan, with red to golden-green fronds
Name Status
Correct
Plant Range
Australasia, Polynesia

How to Grow

Cultivation

Under glass grow in an open, humus-rich compost such as one part each of loam, medium-grade bark and charcoal, two parts sharp sand and three parts leaf mould, in bright, filtered light. Outdoors grow in moist, acid soil in sheltered, partial shade and protect from frost

Propagation

Propagate from spores, or by division in late spring

Suggested planting locations and garden types

  • City and courtyard gardens
  • Mediterranean climate plants
  • Patio and container plants

Pruning

Remove dead or damaged fronds as required

Pests

Generally pest-free

Diseases

Generally disease-free