Dark star mountain lilac (C. impressus x C. papillosus var. roweanus) is an evergreen shrub in the Buckthorn family (Rhamnaceae). This hybrid ceanothus was introduced by Ken Taylor in 1971. In spring the small, dark green leaves are covered in pinkish-purple buds followed by light blue flower clusters.

All ceanothus are attractive to deer, birds and pollinators. Deer eat the flowers and leaves; birds eat the small, black fruits; bees, butterflies, and moths feed from the flowers. Once mature, its branches also create a safe haven for birds and small wildlife.

Dark star grows well in dry, infertile soils on slopes or where drainage is excellent. Ceanothus species are naturally found in sunny, dry locations in chaparral and sunny woodland openings.

In the home garden, this is a show-stopper when it is in bloom, and an evergreen backbone the rest of the year. Place this medium-large shrub where it will not receive supplemental irrigation during the summer after its first year. Overwatering it will decrease its longevity. Surround young shrubs with tall chicken wire for the first year or so after planting, to protect them until they are large enough to tolerate deer grazing.