Dry to moist, rocky, open sites at low to subalpine elevations (Pojar and MacKinnon, 1994).
Coarse-textured, sandy or gravelly, free-draining soils.
Characteristic of moisture-deficient, water-shedding sites.
Climax species on extremely dry sites. Pioneer seral species on dry open sites after disturbance.
Common on dry, exposed rock outcrops in Garry oak ecosystems.