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Clematis montana var. grandiflora (M) AGM

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© RHS 2002

Characteristics

Plant type

Climber/Wall Shrub

Habit

Climbing

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

White in Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

8-12 metres

Ultimate spread

2.5-4 metres

Time to ultimate height

2-5 years


Preferred common name

white anemone clematis

Family

Ranunculaceae


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 seed-heads in autumn

Montana Group clematis are vigorous deciduous climbers with single, 4-petalled flowers opening in late spring and early summer

C. montana var. grandiflora is a very vigorous large deciduous climber with trifoliate leaves. Single pure white flowers to 7cm across from late spring to early summer with occasional later flowers.

Synonym(s)

  • Clematis anemoniflora
  • Clematis montana 'Grandiflora'
  • Clematis 'Grandiflora'

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, West-facing, North-facing or East-facing
  • Sheltered or Exposed

Cultivation

Plant in a moisture-retentive, well-drained soil, with the roots and base of the plant kept cool and shaded by other plants or a layer of pebbles at the base. Plant with the crown 5–8cm (2–3in) deep to encourage shoots to grow from below ground level. Best in a sheltered sunny situation

Soil

  • Moist but well-drained
  • Alkaline or Neutral
  • Chalk, Clay, Sand or Loam

Propagation

Propagate by layering or semi-hardwood cuttings

Suggested planting locations and garden types

Wall-side Borders


How to care

Pests

Young shoots may be troubled by aphids and caterpillars; petals can be eaten by earwigs

Diseases

May suffer from slime flux