California False Indigo

Amorpha californica

Also known as: Napa false indigo

Native to:
Mexico, United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Fabaceae
Genus:
Amorpha
Species:
Amorpha californica
USDA Symbol:
AMCA5

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Shrub
Height:
200 cm
Light Requirements:
Full Sun
Drought Tolerance:
Low
Bloom Months:
apr,may,jun
Bloom Colors:
purple, blue
Landscaping Shrub:
Yes

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)
Caterpillars:
★★☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Host Plant for Caterpillars

Leadplant Flower Moth (Schinia lucens), Nephopterix dammersi, 🛑California dogface butterfly (Zerene eurydice), Marine Blue (Leptotes marina), Northern Cloudywing (Thorybes pylades), Silver-spotted Skipper (Epargyreus clarus), Southern Dogface (Zerene cesonia)

Reported Fauna Sightings

Butterflies:🛑California dogface butterfly (Zerene eurydice)

Garden & Ecology Notes

Wildlife Value:
bees, butterflies, birds
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from root crown after fire. Common in fire-adapted riparian and foothill communities.

Soil Requirements

Soil Type:
well-drained, sandy or rocky soil
pH:
6.0 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
prefers open, sunny locations

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Scarification:
Seed coat scarification required before sowing
Germination Time:
14–30 days
Notes:
Scarification followed by cold stratification improves germination rates. Seeds have hard seed coats typical of legumes.

The above propagation data sourced from Claude AI

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).

Source: Claude AI