Presidio Clarkia
Clarkia franciscana
Care
1–1ft tall
Friendly
Prized
Endemic to the Presidio and nearby areas of San Francisco, coastal scrub below 500 ft elevation
Care Guide
Planting
Plant Presidio clarkia in serpentine soil, which is critical for this species - it will not thrive in standard garden soil. This is an annual herb, so plant it in the season that matches your local growing conditions, though the data doesn't specify optimal timing for the Bay Area. Space plants to allow for mature height of about 12-16 inches. Because this is a rare, federally endangered species endemic to specific Bay Area serpentine sites, sourcing nursery-grown plants from reputable native plant nurseries is essential.
After Planting
Since Presidio clarkia is an annual, it completes its lifecycle in one growing season and will not require long-term maintenance like perennials do. Be aware that seed dormancy is natural for this species - some years you may see no plants at all as seeds remain dormant in the soil until conditions are right, so don't assume the plant has failed if it doesn't appear the first year. Given how rare and specialized this plant is, consult with native plant experts or the nursery where you purchased it for specific watering and establishment guidance tailored to your microclimate.
Wildlife Supported
Insects
early season nectar source for emerging colonies
primary pollinator during Clarkia bloom period
incidental pollinator, larval predators control garden pests
migratory species uses wildflowers during spring passage through California
secondary pollinator, opportunistic forager