Caryopteris clandonensis ‘Dark Knight’ is a fetching shrub, bearing eye-catching deep blue flowers in autumn. It forms a mound of slightly toothed, grey-green leaves with silver hairs on the undersides. It’s perfect for growing in containers or towards the front of a sunny border. Its flowers are a magnet for bees.Caryopteris clandonensis ‘Dark Knight’ in well-drained neutral to acid soil in full sun. Prune plants hard after flowering to enjoy the best show of flowers the following spring.
Its resistance to the cold and to freezing is low, since it suffers when the temperature drops below 23°F (-5°C).