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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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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
Foliage Deciduous
Habit Bushy
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Partial Shade
Aspect South-facing or North-facing or West-facing or East-facing
Exposure Exposed or Sheltered
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilClay, Loam, Sand
pHAcid, Neutral
Ultimate height Higher than 12 metres
Ultimate spread wider than 8 metres
Time to ultimate height 10-20 years
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
Pruning Pruning group 1
Pests Generally pest free
Diseases Generally disease free
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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.