+ Laburnocytisus 'Adamii'

RHS Plant Profile
Adam's laburnum

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Adam's laburnum RHS

Synonyms

+ Laburnocytisus adamii

Trees
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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

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

4-8 metres

Max Spread

2.5-4 metres

Size

Time to Maturity
10–20 years
Max Spread
2.5-4 metres
Max Height
4-8 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
West–facing or South–facing
Exposure
Exposed or Sheltered
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 & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Fabaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling Pets (dogs): Harmful if eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
+ Laburnocytisus is a deciduous tree, a graft-hybrid between laburnum and purple broom, bearing flowers of each separately, also intermediate ones
Name Status
Accepted

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

  • Cottage and informal garden
  • City and courtyard gardens
  • Wall side borders

Pruning

Pruning group 1; remove suckers

Pests

May be susceptible to broom gall mites

Diseases

May be susceptible to honey fungus