Blue false indigo is a large, showy, shrub-like plant with gray-green leaves and 10 to 12 inch medium blue flowers in May. The pea-like flowers are followed by black seed pods which are interesting enough to leave up over the winter. Reliable, drought-resistant and long-lived, blue false indigo provides a strong structural presence in a garden.
This plant has a cultivated variety. Go to list of cultivars.
- Family (English) Pea
- Family (botanic) Fabaceae (formerly Leguminosae)
- Tree or plant type Perennial
- Native locale North America
- Size range Large plant (more than 24 inches)
- Light exposure Full sun (6 hrs direct light daily), Partial sun / shade (4-6 hrs light daily)
- Hardiness zones Zone 3, Zone 4, Zone 5 (Chicago), Zone 6, Zone 7, Zone 8, Zone 9
- Soil preference Dry soil
- Tolerances Clay soil, Dry sites, Occasional drought
- Season of interest early winter, midwinter, late winter, mid spring, late spring, late summer, early fall, mid fall, late fall
- Flower color and fragrance Blue
- Shape or form Vase-shaped
- Growth rate Slow