Buddleja davidii which is also spelled Buddleia davidii is named after a French missionary called Father Armand David. This plant is native to China and Japan. It is sometimes referred to as Summer Lilac, Orange Eye, or Butterfly Bush. Buddleja davidii does look a bit like lilac and of course, it does attract a lot of butterflies therefore the reason for those common names. Buddleja davidii belongs to the Scrophulariaceae family of plants.
This is a multi-stemmed, deciduous shrub that grows to 16ft or 5m. Buddleja davidii produces honey-scented purple flowers from summer into autumn. The flowers are in various shades of purple. They appear in long spikes and produce a lot of seeds. It has lance-shaped green leaves that are the perfect background for the flowers. It is considered an invasive plant in England and New Zealand, the US, or Canada. In fact, in the UK you can see a lot of them as you are riding a train on growing on the sides of the tracks.
Plant Buddleja davidii in full sun or partial shade in well-drained soil. Propagate from cuttings in summer or hardwood cuttings later in autumn. It should be cut back in early spring after the cold. Deadheading will also encourage more flowers and prevents self-seeding. Also don’t leave any clippings on the ground as it could easily take root! No disease but watch out for red spider mite and capsid bug.