When does Amorpha fruticosa bloom?

Amorpha fruticosa blooms from May through July, producing distinctive dense spikes of small purple flowers.

What pollinators visit Bastard Indigo-bush?

Bees, butterflies, and moths are attracted to the nectar-rich flowers of Amorpha fruticosa during its summer blooming period.

Where is Amorpha fruticosa native?

This shrub is native to 23 states across North America, from coastal states like California and Florida to northern regions including Minnesota and North Dakota.

What growing conditions does Bastard Indigo-bush prefer?

Amorpha fruticosa is highly adaptable, tolerating full sun to partial sun and varying moisture levels from wet to dry soils.

Is Bastard Indigo-bush toxic to livestock?

Bastard Indigo-bush is listed as toxic to grazing livestock such as cattle, sheep, and goats (slight severity) by the USDA PLANTS Database. This is separate from pet (dog and cat) toxicity.

Is Bastard Indigo-bush HOA-friendly?

Bastard Indigo-bush takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Bastard Indigo-bush

Name: Pollinator Patch
Author: Pollinator Patch

Amorpha fruticosa

Last reviewed: July 2026

Amorpha fruticosa is a native North American shrub that blooms from May through July with distinctive purple flower spikes. This adaptable plant grows across diverse regions from California to Vermont and attracts bees, butterflies, and moths.

Bastard Indigo-bush (Amorpha fruticosa) — Photo: (c) Gavin Slater, some rights reserved (CC BY), uploaded by Gavin Slater

Bastard Indigo-bush is listed as toxic to grazing livestock (cattle, sheep, and goats) at a slight level by the USDA PLANTS Database (opens in new tab). This is a livestock indicator and is separate from pet toxicity.

Light

full sun

Water

medium

Size

96"–240" H × 72"–144" W

Bloom

May, Jun, Jul

Native to

AL, AZ, CA, CO and 18 more states

Pollinators

bees, butterflies, moths

Deer

Resistant (per Prairie Moon Nursery)

Browse plants for this ecoregion

Coast Range Central California Valley Central California Foothills and Coastal Mountains Southern California Mountains Chihuahuan Deserts Central Oklahoma/Texas Plains Edwards Plateau Texas Blackland Prairies East Central Texas Plains Western Gulf Coastal Plain South Central Plains Sonoran Basin and Range

Bastard indigo-bush is a large native shrub that produces spikes of small purple flowers from May through July. This robust plant can reach 8-20 feet tall and wide, making it suitable for larger landscape spaces where a substantial shrub is desired.

Growing Bastard Indigo-bush

Grow Bastard Indigo-bush in full sun and medium water. Mature plants reach 96 to 240 inches tall and spread 72 to 144 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Bastard Indigo-bush takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Extremely large mature size unsuitable for most residential front yards
Common name includes 'bastard' which some may find objectionable
Can appear somewhat wild and unstructured in growth habit

Wildlife value

Host plant for silver-spotted skipper, dogface butterfly.

The flowers attract bees, butterflies, and moths during its long blooming period. This shrub also provides nesting habitat and cover for birds due to its substantial size.

Common questions

When does Amorpha fruticosa bloom?: Amorpha fruticosa blooms from May through July, producing distinctive dense spikes of small purple flowers.
What pollinators visit Bastard Indigo-bush?: Bees, butterflies, and moths are attracted to the nectar-rich flowers of Amorpha fruticosa during its summer blooming period.
Where is Amorpha fruticosa native?: This shrub is native to 23 states across North America, from coastal states like California and Florida to northern regions including Minnesota and North Dakota.
What growing conditions does Bastard Indigo-bush prefer?: Amorpha fruticosa is highly adaptable, tolerating full sun to partial sun and varying moisture levels from wet to dry soils.
Is Bastard Indigo-bush toxic to livestock?: Bastard Indigo-bush is listed as toxic to grazing livestock such as cattle, sheep, and goats (slight severity) by the USDA PLANTS Database. This is separate from pet (dog and cat) toxicity.
Is Bastard Indigo-bush HOA-friendly?: Bastard Indigo-bush takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow Bastard Indigo-bush? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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