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  • 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
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Liquidambar styraciflua 'Lane Roberts'

sweet gum 'Lane Roberts'

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
© RHS
Sold by 36 nurseries

  • Other common names sweet gum 'Lane Roberts'

  • Family Hamamelidaceae

  • Genus Liquidambar are deciduous trees grown for their alternate, maple-like leaves which take on brilliant and long-lasting autumn colour; flowers and fruits are inconspicuous

  • Details 'Lane Roberts' is a broad-crowned medium-sized deciduous tree with maple-like, dark, glossy green leaves which turn to deep blackish-crimson for several weeks in autumn. Flowers insignificant, sometimes followed by burr-like fruit clusters

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)

    H6

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Sand

    Sand

  • Clay

    Clay

  • MoistureMoist but well-drained, Well-drained

  • SoilLoam, Sand, Clay

  • pHAcid, Neutral

Size

  • Ultimate height Higher than 12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in lime-free soil in sun or partial shade. Suitable for woodlands

Propagation Propagate by semi-hardwood cuttings

Suggested planting locations and garden types Low Maintenance Drought Resistant

How to care

Pruning Pruning group 1

Pests Generally pest free

Diseases Generally disease free

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