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From: Tujunga, CA
Region: California
Topic: Drought Tolerant, Groundcovers
Title: Groundcover for clay soil in Southern California
Answered by: Nan Hampton
Las Pilitas Nursery (with nurseries in Santa Margarita and Escondido, California) has a page with the title "Some of the California native plants that can be used as less than a foot high ground cover". Here are some suggestions from that page—you can find other possibilities there as well:
Baccharis pilularis (Coyotebrush) is very drought tolerant and Las Pilitas has a Dwarf Coyotebrush (Baccharis pilularis pilularis Pigeon Point) that grows to a foot high.
California Buckwheat plants (there are many) are also a good possibility. They are very drought tolerant and maintain their flowers for long periods. In particular, take a look at Eriogonum fasiculatum polifolium (Interior California Buckwheat) and Eriogonum grande rubescens (Red buckwheat) and you can see photos and more information from San Marcos Growers.com.
Salvia sonomensis Farmar-Bower (Golden creeping sage) grows well in clay.
Artemisia californica Canyon Gray (Trailing sagebrush) is very drought tolerant, grows to 1 foot high and tolerates clay soil.
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