• 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

Dryopteris filix-mas 'Grandiceps Wills'

male fern 'Grandiceps Wills'

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
male fern 'Grandiceps Wills'

© RHS

  • Other common names male fern 'Grandiceps Wills'

  • Family Dryopteridaceae

  • Genus Dryopteris can be deciduous, semi-evergreen or evergreen ferns, with stout, erect or decumbent rhizomes and shuttlecock-like rosettes of lance-shaped to ovate, pinnately divided fronds

  • Details 'Grandiceps Wills' is a robust semi-evergreen fern forming a mass of rosettes of arching, lance-shaped, bipinnatifid fronds with large branched terminal crests and small crests at the tips of the pinnae

Characteristics

  • Foliage Semi-evergreen

  • Habit Bushy

  • 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

  • Partial Shade

  • Full Shade

  • Aspect North-facing or West-facing or East-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Sand

    Sand

  • Clay

    Clay

  • MoistureMoist but well-drained, Well-drained

  • SoilLoam, Sand, Clay

  • pHAcid, Neutral, Alkaline

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in moist, humus-rich soil in partial shade with shelter; tolerant of more sun and wind than other species

Propagation Propagate by sowing spores as soon as ripe or by division in spring

Suggested planting locations and garden types Flower borders and beds Underplanting of Roses and Shrubs City & Courtyard Gardens Cottage & Informal Garden

How to care

Pruning Dead or damaged fronds may be removed as necessary

Pests Generally pest free

Diseases Generally disease free but moth larvae may feed on spores

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