• 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

Astelia chathamica

silver spear

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
silver spear

© RHS

  • Other common names silver spear

  • Family Asteliaceae

  • Genus Astelia are clump-forming, rhizomatous evergreen perennials with arching, linear, keeled, silvery leaves and panicles of small, pale greenish or brown flowers, followed on female plants by orange or red berries

  • Details A. chathamica is an evergreen perennial to 1.2m tall, forming a large clump of silvery, sword-shaped leaves, with panicles of small greenish flowers followed, on female plants, by orange berries

  • Plant range New Zealand

Characteristics

  • Foliage Evergreen

  • 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)

    H3

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilClay, Loam

  • pH

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation Grown in moist, but reasonably well-drained, fertile, peaty soil in full sun or partial shade and sheltered spot. The foliage can be damaged by frost and prevailing cold winds. It may need winter protection

Propagation If necessary, divide in spring. Propagate by seed, sow seeds in containers in a cold frame as soon as ripe

Suggested planting locations and garden types Architectural City & Courtyard Gardens Coastal

How to care

Pruning Remove or trim winter damaged foliage in spring

Pests Generally trouble free

Diseases Generally trouble free

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