"Ray Hartman Ceanothus is a cultivated hybrid of Ceanothus arboreus and Ceanothus griseus. It originated by chance in 1929 at the Leonard Coates Nurseries in Morgan Hill, CA, and is now widely grown in nurseries throughout California. It has dark green glossy leaves, and grows quickly up to 15 feet in height and 10 feet in width. Its blue flowers range from powder blue to dark blue.
Ray Hartman Ceanothus is one of the easiest to grow of all the Ceanothus cultivars in California. In general, it's best to grow Ceanothus species native to your area. Ray Hartman Ceanothus may be the exception that proves the rule. While its parents are native to the channel islands and the coast of north-central california, it grows reliably throughout the state in both coastal and interior areas, as long as temperatures stay above 10-15 degrees, It tolerates fairly dry soil and naturalizes well in areas with just a little more than average soil moisture during the dry season, such as slope bottoms and north facing slopes. It also tolerates supplemental irrigation up to once per week, though still better not to water directly during the summer or early fall once established or it'll likely have a shortened life. It will get all the water it needs as it stretches it's roots out to nearby irrigated areas."
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