Buddleja davidi

Blue Horizon

B. ‘Blue Horizon’ is a stunning show stopper in late July and August with a compact upright habit and medium to dark green leaves. The rich sapphire blue flowers with a yellow throat is one of the best Buddleja around, we consider it far better than B. davidii ‘Empire Blue’.


The plant is though to have originated at the nursery of Bob Brown, Cotswold Garden Flowers but the date is unknown.

  • Flower Colour: Rich sapphire blue
  • Habit: Upright
  • Eventual height: 180-210cm (6-8ft) Spread: 180-210cm (6-8ft)
  • Hardiness: Very hardy - 20°C USDA zones 5-9
  • Leaf colour: Medium green
  • Flowering: Very floriferous. The flowers are 25-30cm (9-12") in length
  • Fragrance: Sweetly scented and rich in nectar
  • 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 B037

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 davidii
  • Cultivar ‘Blue Horizon' AGM
  • Category semi - deciduous Shrub
  • Colours and sizes are approximate and are intended as a guideline, cultivation notes should be followed

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

Cultivation of Plants