Clematis macropetala Blue Lagoon

Blue Lagoon clematis

Clematis macropetala 'Blue Lagoon' gets its name from the deep blue nodding bell-shaped flowers with yellow and white centres, which are freely produced in spring.

The flowers are large, between 5cm-8cm in diameter.

A second flowering may occur in August too.

Clematis macropetala 'Blue Lagoon' was raised by George Jackman and Son, England, and released in 1958. It is sometimes known as 'Lagoon'.

How to grow

‘Blue Lagoon’ will thrive in any aspect and grow to a height of 2m - 2.5m.

No pruning is necessary.

Blue Lagoon characteristics


  • Flowering time: Spring Late summer
  • Attractive features: Attractive flowers
  • Useful for: Wall training Screening
  • Gardening skill: Beginner
  • Flowering duration: Average (2-3 weeks)
  • Height after 10 years: 2.5m-3.5m / 8ft-12ft
  • Growth rate: Average
  • Growth habit: Climbing
  • Spread after 10 years: 1m-2m / 3ft-7ft
  • Light requirement: Prefers full sun Some shade
  • Pruning: No need to prune


  • Cold hardiness (RHS): H6 (to -20C)
  • Cold hardiness (USDA): (6) -10F / -23C


  • Country of origin: United Kingdom
  • Period of origin: 1950 - 1999
  • Flower colour: Blue
  • Flowering month: April May August
  • Flower form: Double flower (25-50 petals)
  • Leaf colour: Green
  • Leaf colour - young: Green
  • Annual cycle: Deciduous