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Ceanothus hearstiorum is a species of flowering shrub known by the common names Hearst Ranch Buckbrush and Hearst's Ceanothus. This Ceanothus is endemic to California, where it grows wild only on the hilly coastline of San Luis Obispo County. This shrub is generally wider than it is tall and often lies prostrate in a mat on the ground. The younger branches are hairy and somewhat feltlike in texture. The distinctive evergreen leaves are oval to almost rectangular and have a cupped, rippled surface. The edges are toothed with tiny hairy knobs and the shiny surface may be dotted with more knobs. The underside of the leaf is fuzzy to hairy. The flower clusters are borne on short, stout stalks and the tiny flowers are lavender to blue with prominent yellow-anthered blue stamens. This plant prefers to be near the coast where it would have cooler temperatures and some fog. If planted inland, give afternoon shade and an occasional rinse in the summer. It is a rare plant in the wild due to its extremely limited distribution. However, it is a popular garden plant and is readily available at nurseries.

Fast growing it can mature in 18 months, and can be trained into a small tree or even espaliered. Flowers appear in early spring, medium blue with a frosted appearance hence the name. Frosty Blue is one of the most adaptable of the ceanothus. It tolerates most soil types including heavy clay and sandy soil and likes both sun or light shade. Heat, drought and frost tolerant to degrees F.