Buddleja davidii 'Pixie'
'Pixie White', Longstock Park, UK
The origin of the Buddleja davidii 'Pixie' series is unknown. As the plants can grow in excess of 2 m in height, it has been speculated that the name 'Pixie' alludes to the shape of the inflorescence, not the plant's size.
The 'Pixie' buddlejas grow to a height of 2 m and a greater width, with panicles of flowers 15–20 cm long. Available in three colours, 'Pixie Blue', 'Pixie Red' and 'Pixie White', the narrow leaves have led some to believe the plants have nanhoensis in their ancestry. 
The 'Pixie' series has had only a limited impact in the UK and is not known in the USA. Specimens of 'Pixie Blue' and 'Pixie White' are grown as part of the NCCPG national buddleja collection held by the Longstock Park Nursery near Stockbridge, Hampshire, UK.  Hardiness: USDA zones 5–9.