Description: Hybrid of Ceanothus impressus and Ceanothus papillosus var. roweanus. Ceanothus ‘Dark Star’ is a compact shrub growing to about 6 feet tall by 8 feet wide. The leaves are small, rough-textured and dark green. In spring the dark cobalt-blue flower clusters with yellow stamens give the impression of a starry night (hence the name). Plant in full sun in well-draining soil. ‘Dark star’ requires little or no water in summer. It is hardy to 15 degrees F. This Ceanothus impressus hybrid is one of the showiest of the California Lilacs, but has a reputation for being fussy in inland gardens.
Sun: Full Sun, Part Shade
Cold Tolerance: Tolerates cold to 15°F
Soil Drainage: Fast, medium, slow
Soil Description: Tolerates a wide variety of soils
Common uses: Bee Gardens
Calscape website has more information.