• 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

Moluccella laevis

bells of Ireland

  • Other common names bells of Ireland
    Irish bell flower

    Irish bells
    Irish green bells
    needles and thread
    old maid's nightcap
    shell flower
    smooth molucca balm

    see more
  • Family Lamiaceae

  • Genus Moluccella are erect annuals with opposite, scalloped, broadly ovate leaves and dense spikes of small 2-lipped flowers with large, bell-shaped calyces; useful for dried flower arrangement

  • Details M. laevis is a upright annual to 90cm tall, with bluntly toothed ovate leaves and, in late summer, long spikes of small, 2-lipped white or pale pink flowers, each held within a large, white-veined, pale green, bell-shaped calyx; good dried flower

  • Plant range Europe Asia

Characteristics

  • Foliage Deciduous

  • 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)

    H4

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAlkaline, Neutral, Acid

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1 year

How to grow

Cultivation Grow in moderately fertile, moist but well-drained soil in full sun

Propagation Propagate by seed at 13-18?C (55-64?F) in early or mid-spring, or in situ in late spring

Suggested planting locations and garden types Flower borders and beds Coastal City & Courtyard Gardens Cottage & Informal Garden Patio & Container Plants

How to care

Pruning No pruning required

Pests Generally trouble free

Diseases Generally trouble free

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.