Batten Blooms
PL. —Lupinus albifronsBotanical illustration — drop image
Lupinus albifrons

Silver Bush Lupine

SpringSummer
7a–10bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Peak bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Lupinus albifrons is a native California and Oregon shrub with silvery-white foliage produced by dense fine hairs on leaves and stems. In spring and early summer it bears racemes of violet to purple pea-flowers. As a legume it fixes atmospheric nitrogen, improving soil fertility for neighboring plants.

The shrub is native to coastal sage scrub, chaparral, foothill woodland, and dry open clearings. It is adapted to lean, well-drained soils and full sun and tolerates summer drought typical of its range. Wet soils, clay, and regular irrigation noticeably shorten its lifespan. Seeds require scarification to germinate reliably and perform best when direct-sown in fall before seasonal rains; lupines resent root disturbance and transplant poorly.

Silver bush lupine is a documented larval host for the mission blue butterfly (Icaricia icarioides missionensis), a federally endangered species. It also supports native bees and hummingbirds and is used in habitat restoration plantings throughout coastal and foothill California.

Good companions
California BuckwheatCalifornia LilacDeergrassCalifornia FuchsiaCleveland SageCoyote Brush
Care guide
SunFull sun
WaterLow
SoilWell-drained, sandy, dry, low fertility
Spacing3–5 ft
Height2–5 ft
Zone7a – 10b
Native RegionCA, OR
Direct sowFrost hardy
Seasonal tasks
spring
watchCheck new growth for lupine aphid (Macrosiphum albifrons) colonies in spring; dislodge with a strong water spray or treat with insecticidal soap if populations are heavy.
watchScout for anthracnose — dark lesions on leaves and stems — during wet spring weather. Remove and dispose of affected material promptly.
summer
cutCollect seed pods just before they shatter if saving seed for propagation; store dry in paper envelopes.
cutAfter seed set, lightly trim spent growth to tidy the plant. Do not cut into old woody stems — lupine shrubs do not regenerate reliably from hard pruning.
fall
sowScarify seeds by nicking the coat or soaking in hot water for 2–4 hours, then direct sow into well-drained ground in fall before seasonal rains begin.
watchMonitor foliage for powdery mildew during dry spells with cool nights in fall; improve air circulation and eliminate any overhead watering.
Common problems

Lupin Anthracnose

Symptoms

Twisted, bending stems with sunken brown lesions; leaves develop dark spots and may collapse. Pink spore masses can appear on infected tissue in wet weather.

Treatment

Remove and destroy infected plants. Use clean, treated seed and avoid overhead watering. Space plants for airflow and rotate planting sites to reduce spore buildup.

Fungal leaf spot

Symptoms

Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.

Treatment

Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.

Phytophthora Root Rot

Symptoms

Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.

Treatment

Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.