Whiskerbrush
Leptosiphon ciliatus
Care
0–1ft tall
Friendly
Prized
Coastal hills and scrub of the San Francisco Bay Area from Marin County to Santa Clara County, below 2000 ft elevation
Care Guide
Planting
Plant Whiskerbrush in spring to give it a full growing season before summer heat. This is a California native annual that thrives in the lean, well-draining soils of chaparral and grassland habitats, so avoid rich garden soil and ensure excellent drainage. Space plants about 6 inches apart to account for their mature height of 1 foot or less. While specific sun requirements aren't documented, its native range across multiple California ecosystems suggests it's adaptable, though starting it in a bright location is a safe bet.
After Planting
Whiskerbrush is an annual, meaning it completes its entire life cycle in one year - it will bloom from March through July (depending on your specific Bay Area microclimate) and then naturally decline as temperatures rise. Water moderately during establishment and the growing season, but this drought-tolerant native should need minimal supplemental water once established, especially if planted in well-draining soil. Let the plant go dormant and die back naturally in summer; no special pruning is needed. The biggest mistake is overwatering or planting in heavy clay soil, which will rot the roots of this lean-soil specialist.
Endangered & Threatened Species Supported
Known from very limited California locations
Wildlife Supported
Insects
larval food plant; caterpillars feed on foliage during spring growth
foliage feeding during active plant growth; potential disease vector
fungal pathogen affecting plant health; can reduce plant vigor