• AGM plants

    AGM plants have been through a rigourous 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

Asplenium scolopendrium

Hart's tongue fern

AGM plants

AGM plants have been through a rigourous 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
Hart's tongue fern

© � RHS 2002

  • Other common names Hart's tongue fern
    Burnt weed

    Buttonhole
    Christ's hair
    Horse tongue

    see more
  • Synonyms Phyllitis scolopendrium

  • Genus Asplenium are evergreen ferns with short, usually erect rhizomes bearing a rosette of slightly leathery fronds which may be simple, pinnate to 3-pinnate

  • Family Aspleniaceae / Aspleniaceae

  • Species A. scolopendrium is an evergreen fern forming a rosette of arching, rich green, strap-shaped fronds 30-75cm in length, the margins often undulate. Spores borne in conspicuous transverse stripes beneath the fronds

  • Plant range Temp. N. Hemis.

Characteristics

  • Foliage Evergreen

  • Habit Tufted

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H6

Colour

Sunlight

  • Full Shade

  • Partial Shade

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

  • Exposure Exposed or Sheltered

Soil

  • Chalk

    Loam

  • Chalk

    Chalk

  • Chalk

    Sand

  • Chalk

    Clay

  • MoistureMoist but well-drained

  • SoilLoam, Chalk, Sand, Clay

  • pHAlkaline, Neutral

Size

  • Ultimate height

    0.1-0.5 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    5-10 years

How to grow

Cultivation Grows well in humus-rich, moist but well-drained soil. Bright mid-day sun can cause damage. May be sensitive to fungicides.Tolerant of dry shade but water regularly during the first season and mulch well

Propagation Propagate by sowing spores in mid to late summer or by division in spring. Peeled leaf bases can be taken off from where the stem joins with the root. Old leaf bases that are green at the base are incubated in a plastic bag of loam based media. Green swellings can be found and potted to raise new plants

Suggested planting locations and garden types Flower borders and beds Ground Cover 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 outdoors

Diseases May be infected by a rust in mild, damp winters

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