• 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

Acer shirasawanum 'Autumn Moon'

Shirasawa maple 'Autumn Moon'

Shirasawa maple 'Autumn Moon'

© RHS

  • Other common names Shirasawa maple 'Autumn Moon'

  • Synonyms Acer palmatum 'Autumn Moon'
    Acer 'Autumn Moon'

  • Family Sapindaceae

  • Genus Acer can be deciduous trees or large shrubs with paired, often palmately-lobed leaves and small flowers followed by characteristic winged fruits. Many have fine autumn colour, and some have ornamental stems

  • Details 'Autumn Moon' is a bushy tree or large shrub, up to about 6m high, with grey-brown bark, and rounded eleven-lobed leaves about 6cm across. Leaves are clear yellow or yellowish-green, but in full sun are green with yellowish veins; in both situations they are tinged burnt-orange and turn orange-red in autumn. Cream and pink flowers, in spring, are held in upright spreading clusters, and are followed by winged near-horizontal greenish-brown fruits about 2cm across

Characteristics

  • Foliage Deciduous

  • Habit Spreading / Branched

  • 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

  • Partial Shade

  • Full Sun

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

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Sand

    Sand

  • Clay

    Clay

  • MoistureMoist but well-drained

  • SoilLoam, Sand, Clay

  • pHNeutral, Acid

Size

  • Ultimate height 4-8 metres

  • Ultimate spread 4-8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Grow in moist but well-drained acidic or neutral soil in partial shade or full sun; for more advice, see Japanese maple cultivation

Propagation Propagate by softwood cuttings

Suggested planting locations and garden types Low Maintenance Cottage & Informal Garden City & Courtyard Gardens Patio & Container Plants

How to care

Pruning Pruning group 1 (little or no pruning of trees and shrubs)

Pests May be affected by scale insect, including horse chestnut scale, and aphids, mites, and caterpillars; plants in containers may be affected by vine weevil larvae

Diseases May be affected by coral spot, Phytophthora root rot, verticillium wilt, honey fungus, and acer leaf scorch

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