Caryopteris × clandonensis 'Dark Knight'
- Position: full sun
- Soil: moderately fertile, light, well-drained soil
- Rate of growth: average
- Flowering period: August and September
- Hardiness: fully hardy
It is also a magnet for bees and butterflies and is drought-tolerant. Where temperatures fall below -15°C it's best grown against a warm, south or west-facing wall.
- Garden care: In March prune all of the flowered stems back hard to the permanent framework. After pruning apply a generous 5-7cm (2-3in) mulch of well-rotted garden compost around the base of the plant.