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Clematis macropetala 'Lagoon' Jackman 1959 (A/d) AGM

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© RHS 1999

Characteristics

Plant type

Climber/Wall Shrub

Habit

Climbing

Resilience

Hardiness

H6 (hardy - very cold winter)

Colour

Flower

Blue and Purple in Spring and Summer

Foliage

Green in Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

5-10 years


Preferred common name

clematis 'Lagoon'

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

Double-flowered Atragene Group clematis are woody climbers with deciduous, 1 to 2-ternate leaves and nodding, bell-shaped double flowers to 10cm across, on old wood in spring and early summer, occasionally also later, on current year's growth

'Lagoon' is a slender deciduous climber with deep violet-blue flowers to 7.5cm across in spring and early summer

Synonym(s)

  • Clematis macropetala 'Blue Lagoon'

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-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 new shoots to grow from below ground level. Can be grown in containers at least 45cm (18in) deep and wide in a soil based potting compost

Soil

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

Propagation

Propagate by layering or semi-hardwood cuttings

Suggested planting locations and garden types

City/Courtyard Gardens, Cottage/Informal Garden, Flower borders and beds or Wall-side Borders


How to care

Pests

Young plants may be troubled by aphids

Diseases

May suffer from clematis slime flux