• AGM plants

    AGM plants have been through a rigourous 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

Cytisus × kewensis

Kew broom

AGM plants

AGM plants have been through a rigourous 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
Kew broom

© � RHS 1999

  • Other common names Kew broom

  • Genus Cytisus can be deciduous or evergreen shrubs, ranging from prostrate to erect and almost tree-like, with small, simple or 3-parted leaves and pea-like flowers spring or summer

  • Family Papilionaceae / Papilionaceae

  • Species C. x kewensis is a small, prostrate deciduous shrub with arching branches. Leaves small, trifoliate; flowers cream in late spring

Characteristics

  • Foliage Deciduous

  • Habit Mat forming

  • Toxicity All parts, especially the seeds, may cause mild stomach upset if ingested

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H5

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-drained

  • SoilSand, Loam

  • pHAcid, Neutral

Size

  • Ultimate height

    0.1-0.5 metres

  • Ultimate spread

    1-1.5 metres

  • Time to ultimate height

    5-10 years

How to grow

Cultivation Grow in moderately fertile well-drained soil in full sun. Will thrive in poor acid soil, and although lime-tolerant may become chlorotic on shallow chalk soils. Plant when small, they resent transplanting

Propagation Root semi-ripe cuttings in late summer or early autumn and hardwood cuttings in midwinter

Suggested planting locations and garden types Banks and Slopes Flower borders and beds City & Courtyard Gardens Coastal Cottage & Informal Garden Gravel Garden Rock Garden

How to care

Pruning Minimal pruning required but pruning group 1 or pruning group 3 if necessary. Do not cut into old wood

Pests Gall mites may be a problem

Diseases Generally trouble free

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