Yellow Bush Penstemon
Keckiella antirrhinoides
Care
full sun, part shade
low
Fast, Medium; Tolerates a variety of soils as long as adequate drainage is provided.
2–7ft tall , 2–4ft wide
Mar-May
Deciduous
Resistant
Prized
Chaparral and oak woodlands of southern California mountains and foothills, 1500-5000 ft elevation
Care Guide
Planting
Plant your Yellow Bush Penstemon in full sun with fast-draining to medium soil - drainage is non-negotiable for this chaparral native. It tolerates a variety of soil types as long as water doesn't linger, so amend heavy clay with compost or coarse sand before planting. Spring is your best window for planting in the Bay Area. Space plants 3–4 feet apart, as they'll grow 2–7 feet tall and spread with age.
After Planting
Water weekly during your first summer to establish roots, then taper to once or twice monthly once established - this plant thrives on drought and actually prefers neglect. Expect significant leaf drop after flowering (spring through May) and again during dry periods; this is normal deciduous behavior, not a sign of stress. Prune lightly after flowering if you want to shape it, but resist the urge to fuss - the #1 mistake is overwatering, which kills this plant faster than heat or cold ever will. It'll handle Bay Area winters down to 0°F with no problem.
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Endangered & Threatened Species Supported
Listed under California ESA; range has contracted significantly
California endemic subspecies; restricted range in Kern County
California Species of Special Concern
California Species of Special Concern
Wildlife Supported
Insects
Critical larval food plant for caterpillars in spring; host plant utilization subspecies-dependent
Nominal subspecies; primary host plant in coastal California populations
Subspecific host plant relationship; larvae feed on foliage in spring months
Subspecific population utilizing this host plant; early spring caterpillar development
Important early spring nectar source for queen establishment and colony founding
Caterpillar host plant; spring larval development period
Pollen and nectar collection during bloom period; supports managed hive populations
Birds
Seed consumption in fall; year-round resident utilizing available seed resources
Spring blooms provide early season nectar for resident and migrant hummingbirds