Caryopteris × Clandonensis ‘Dark Knight’

The flowers of this handsome shrub are really useful for adding late colour to the border, and their rich purple-blue colouring looks wonderful against the foliage, which has a silvery reverse. Acting as a magnet for bees and butterflies, it’s a great addition to a wildlife-friendly garden, and once established, it will become drought-tolerant. Where temperatures fall below -15°C it’s best grown against a warm, south or west-facing wall.