• 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

Emmenopterys henryi

Henry's emmenopterys

Henry's emmenopterys

© RHS

  • Other common names Henry's emmenopterys

  • Family Rubiaceae

  • Genus Emmenopterys are deciduous trees with a spreading habit and leathery leaves. Funnel- or bell-shaped flowers develop in clusters on the ends of the branches

  • Details E. henryi forms a spreading tree with oval leaves up to 20cm long, dark green above, paler below and bronze-purple when young. Clusters of funnel-shaped white flowers, 2.5cm across, some with a large, white bract, can appear on mature trees but only in a long, hot summer

  • Plant range C & W China

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)

    H5

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Loam

    Loam

  • Chalk

    Chalk

  • MoistureMoist but well-drained

  • SoilClay, Loam, Chalk

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 8-12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Needs a fertile, humus-rich, moist but well-drained soil in full sun and protection from cold, drying winds. Tolerant of both slightly acid and chalk soils

Propagation Take softwood cuttings in early or midsummer

Suggested planting locations and garden types City & Courtyard Gardens Cottage & Informal Garden

How to care

Pruning Pruning group 1

Pests Generally trouble free

Diseases Generally trouble free

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