Buddleja asiatica

Flowering in the glasshouse at Longstock Park Nursery 4th February 2019

A tender deciduous shrub native to a vast area of the East Indies, including IndiaNepalBangladeshChinaTaiwanBurmaThailandLaosCambodiaVietnamMalaysiaNew Guinea, and the Philippines, growing in open woodland at elevations < 2,800 m either as understorey scrub, or as a small tree.[1

but for most of Europe  it  requires frost protection. As a early flowering Buddleja it must be one of the best  in a glass house or conservatory with long highly scented white flowers truly awesome

it is certainly worth a visit to Longstock Nursery