Buddleja davidi

Summer House Blue

This fine compact cultivar was cloned from a seedling found growing near the eponymous summer house at Longstock Park, with silver grey leaves and beautiful iridescent palest china blue flowers.

A winner, certainly in my top ten and our customers like it too.



When Peter Moore became Keeper of the National Collection of Buddleja in 2005, the plants by the summer house had become no more than an overgrown closely planted hedge and many of the labels were lost.

It was decided to replant the best of the B. davidii cultivars in a new display within the nursery gardens. Half of the plants in the original border were removed however, Peter noticed one plant struggling to survive which had a very silver leaf, certainly too good to destroy.

During a visit to Longstock by the International Plant Propagators Society none of the 85 delegate knew the correct name, so Peter named it B. ‘Summer House Blue’ as it was cloned from a seedling found growing near the eponymous “Summer House”.


  • Flower Colour: China blue with an orange throat
  • Habit: Compact erect
  • Eventual height: 100-150cm (3-5ft) Spread: 60-90cm (2-3ft)
  • Hardiness: Very hardy - 20°C USDA zones 5-9
  • Leaf colour: Medium silver grey
  • Flowering: Very floriferous. The flowers are 20-25+cm (8-9+") in length
  • Fragrance: Sweetly scented
  • Situation: Prefers a sunny position
  • Wildlife: Good for bees, butterflies and other insects
  • Later in the year some close up images of the flowers and leaves will be added along with a botanical description.

Project Details



Place of Origin

Central China, west China and Japan

Plant Heritage

Accession Number B169

All details of our collection are held on the main Plant Heritage database including plant name, accession number, date of accession and plant source.


15 Buddleja were awarded an AGM  at the 2008-10 Wisley Trial.  It was mainly the  Buddleja davidii that were judged but we have many others in our 160 +collection which are worthy winners

  • Genus Buddleja
  • Species ddavidii
  • Cultivar 'Summer House Blue’
  • Category semi - deciduous Shrub

Find out more about soil feeding, pruning and pest control.

Cultivation of Plants