The Buddleja (Buddleja davidii) or Butterfly-bush, is a species of plant in the Buddlejaceae.
This alien species is widespread in Britain, and is famous for it's attraction to butterflies. The flowers are usually dark purple, but can be pink or white, and form large clumps. This shrub is evergreen, and the leaves are slightly wooly. This species can reach up to 5m in height, and is found in wastelands and gardens. Native of China, this species flowers from June till October.
It is worth checking the flowers throughout the year, but particulary in Autumn, when some rare migrant butterflies may be feeding. Also worth checking at night, when moths will feed on the flowers.
Very few species feed on the leaves of this species, but there is a few species which mine the leaves.