• 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

Muscari armeniacum 'Christmas Pearl'

grape hyacinth 'Christmas Pearl'

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
grape hyacinth 'Christmas Pearl'

© RHS

  • Other common names grape hyacinth 'Christmas Pearl'

  • Family Asparagaceae

  • Genus Muscari are bulbous perennials with linear or strap-shaped leaves and small bell-shaped, tubular or urn-shaped flowers borne in a dense raceme on an erect leafless stem

  • Details 'Christmas Pearl' is a bulbous perennial producing tightly packed spikes of bright blue, fragrant flowers in winter. The leaves start to grow in autumn and may reach 30cm by spring, though they tend to flop over

Characteristics

  • Foliage Deciduous

  • Habit Tufted

  • Fragrance Flower

  • 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)

    H6

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure 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 1-2 years

How to grow

Cultivation Plant 10cm deep in autumn in any moderately fertile, well-drained soil. Lift and divide (when dormant in summer) congested clumps to maintain vigour. May be invasive

Propagation Propagate by separating offsets in summer

Suggested planting locations and garden types Flower borders and beds Garden Edging Low Maintenance Underplanting of Roses and Shrubs Cottage & Informal Garden Gravel Garden Patio & Container Plants

How to care

Pruning No pruning required, but can remove spent foliage in late spring

Pests Generally pest free

Diseases May be subject to a virus

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