• 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

Acis autumnalis

autumn snowflake

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
autumn snowflake

© RHS

  • Other common names autumn snowflake

  • Family Amaryllidaceae

  • Genus Acis are dainty bulbous perennials with linear leaves and nodding, bell-shaped, pure white or occasionally pink flowers

  • Details A. autumnalis is a bulbous perennial to 15cm in height, with narrow, grassy foliage and stems with 2-4 nodding white bell-shaped flowers 12mm in width, opening with or before the leaves in late summer

  • Plant range W Europe, N Africa

Characteristics

  • Foliage Deciduous

  • 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)

    H5

Colour

Sunlight

  • Full Sun

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

  • Exposure Exposed or Sheltered

Soil

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 2-5 years

How to grow

Cultivation Plant dry bulbs, 8 to 10cm deep, in autumn, in any moist but well-drained soil in full sun

Propagation Propagate by seed, sown in autumn, in containers in a cold frame or separate offsets after the leaves have died down

Suggested planting locations and garden types Rock Garden

How to care

Pruning No pruning required

Pests Susceptible to slugs and narcissus bulb fly

Diseases Generally disease free

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