• 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

+ Laburnocytisus 'Adamii'

Adam's laburnum

Adam's laburnum

© RHS

  • Other common names Adam's laburnum

  • Family Papilionaceae

  • Genus + Laburnocytisus is a deciduous tree, a graft-hybrid between laburnum and purple broom, bearing flowers of each separately, also intermediate ones

  • Details 'Adamii' is a small spring-flowering deciduous tree with some branches bearing foliage and yellow flowers of common laburnum, others those of purple broom, and many intermediate dull yellowish-pink flowers

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Toxicity All parts toxic by ingestion

  • 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 or Exposed

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilLoam, Chalk, Clay, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 4-8 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in moderately fertile, moist but well-drained soil in full sun

Propagation Propagate by grafting onto laburnum seedlings in winter

Suggested planting locations and garden types Wall-side Borders Cottage & Informal Garden City & Courtyard Gardens

How to care

Pruning Pruning group 1; remove suckers

Pests Generally trouble free although occasionally leaf miners and blackfly may be troublesome

Diseases Honey fungus may be troublesome

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