• 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

Clematis × cartmanii 'Joe' (Fo/m)

clematis 'Joe'

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
clematis 'Joe'

© RHS 1999

  • Other common names clematis 'Joe'

  • Family Ranunculaceae

  • Genus Clematis can be deciduous or evergreen shrubs or herbaceous perennials, mostly climbing by twining leaf-stalks, and often with showy flowers. Some have attractive fluffy seedheads in autumn

  • Horticultural Group Male Forsteri Group clematis are dwarf spreading or prostrate evergreen shrubs, usually dioecious, with deeply cut, trifoliate leaves and small cream or white, sometimes fragrant, male flowers

  • Details 'Joe' is a compact trailing or scrambling evergreen climber with divided, leathery, dark green leaves and clusters of bowl-shaped, white flowers 4cm across in early spring

Characteristics

  • Foliage Evergreen

  • Habit Climbing

  • 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)

    H4

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Sheltered

Soil

  • Chalk

    Sand

  • Chalk

    Chalk

  • Chalk

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Prefers well-drained gritty soil in full sun or part shade with shelter. Plant with the crown 5-8cm (2-3in) deep to encourage shoots to grow from below ground level. Can be grown in a container in a cold greenhouse or conservatory

Propagation Propagate by semi-ripe cuttings or layering

Suggested planting locations and garden types Flower borders and beds Wall-side Borders City & Courtyard Gardens Cottage & Informal Garden Gravel Garden Patio & Container Plants

How to care

Pruning Pruning (clematis) group 1

Pests Aphids, slugs and snails may attack young growth

Diseases Generally disease free but clematis wilt or clematis slime flux can be occasional problems

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