The ‘Dark Knight’ Caryopteris has deep purple or blue flowers.  The colors are very dramatic.  This is a low, mounded shrub that is slightly aromatic.  Cut the plant back in the winter. Very attractive to butterflies.

Bloom Time:  Summer.

Growth Habit:  Low, Mounded, 2′ in height.

Foliage:  Gray-Green.

Sun/Shade:  Sun.

Hardiness Zones:  6-9.