• 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

Cercis siliquastrum

Judas tree

Judas tree

© RHS 1998

  • Other common names Judas tree
    love tree

  • Family Caesalpiniaceae

  • Genus Cercis are deciduous shrubs or small trees with heart-shaped leaves and clusters of bright pink pea-flowers opening before or with the leaves, followed by flattened, deep purple pods

  • Details C. siliquastrum is a bushy, deciduous small tree. Leaves to 10cm in width, broadly heart-shaped. Flowers rosy-pink, pea-shaped, in clusters on the older wood. Fruit a conspicuous flattened purplish pod to 12cm in length

  • Plant range E Mediterranean

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

  • Partial Shade

  • Aspect North-facing or East-facing or South-facing or West-facing

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-drained

  • SoilChalk, Clay, Sand, Loam

  • 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 Grow in well-drained soil in sun or partial shade

Propagation Propagate by seed and semi-hardwood cuttings

Suggested planting locations and garden types Architectural

How to care

Pruning Pruning group 1

Pests Generally pest free

Diseases Verticillium wilt and coral spot may be a problem

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