California False Indigo
Amorpha californica
Also known as: Napa false indigo
- Native to:
- Mexico, United States
Anthony Valois and the National Park Service






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