Information from the Jepson Horticultural Database for
Ceanothus greggii var. perplexans

Given excellent drainage (modification of compacted or other water-holding soils may be necessary) and full or nearly full sun (tolerates summer afternoon sun), grows especially well in zones 7 and 18 and also in zones 2, 3, and 10.

Given excellent drainage (modification of compacted or other water-holding soils may be necessary), moderate summer watering, and full or nearly full sun (tolerates summer afternoon sun), grows especially well in zones 19, 20, and 21 and also in zones 11 and 14.

Especially good for stabilizing or restoring disturbed or degraded areas. May be less suitable for general garden use.