• 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

Sternbergia lutea

Winter daffodil

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
Winter daffodil

© � RHS

  • Other common names Winter daffodil
    Fall daffodil

    Lily of the field
    Yellow amaryllis
    Yellow starflower

    see more
  • Genus Sternbergia are bulbous perennials with linear or strap-shaped basal leaves and solitary crocus-like flowers on leafless stems in autumn, late winter or spring

  • Family Amaryllidaceae / Amaryllidaceae

  • Species S. lutea is a clump-forming bulbous perennial to 15cm in height, with narrow, dark green leaves and solitary deep yellow, goblet-shaped flowers in autumn

  • Plant range Med to C Asia

Characteristics

  • Foliage Deciduous

  • Habit Clump-forming

  • 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

    H4

Colour

Sunlight

  • Full Sun

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

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-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 15cm deep in late summer in any moderately fertile, sharply drained soil. Protect from excessive winter wet

Propagation Propagate by seed, sown with moderate heat as soon as ripe. Separate offsets when dormant

Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden Mediterranean Climate Plants Rock Garden

How to care

Pruning No pruning required

Pests May be damaged by narcissus bulb fly and narcissus eelworm

Diseases May be subject to a virus

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