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False Indigo Bush

Amorpha fruticosa

$23.00
1 Gallon USDA Zones 4–9 Full Sun and Part Shade Matures 6–12 Feet

Amorpha fruticosa, the false indigo bush, lifts long spires of blue-purple, orange-anthered flowers over soft, ferny foliage, a fast, tough, nitrogen-fixing native shrub for wet ground or dry.

Pickup available at Aiken Nursery

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Amorpha fruticosa, the false indigo bush, is the largest and most widespread of the native false indigos, a fast, open, deciduous shrub that carries long spires of tiny deep blue-purple flowers, each lit with a single vivid orange anther, at the branch tips in late spring and early summer. From a suckering base rise arching stems six to twelve feet tall, clothed in soft, ferny, pinnate leaves that give off a clean, resinous scent when crushed. In full bloom the whole shrub seems to smoke with color, and the flower spikes hum with bees.

A plant of floodplains, streambanks, gravel bars, and swamp margins across most of the United States and into Canada and Mexico, the false indigo bush is one of the toughest and most adaptable of native shrubs, at home in wet ground and dry alike. The name Amorpha, from the Greek word for shapeless, marks the odd single-petaled flower, so unlike the usual winged pea blossom of the bean family to which the plant belongs. As a legume, false indigo fixes nitrogen at the roots and builds the poorest soils, and the foliage feeds the caterpillars of the silver-spotted skipper and several other native butterflies and moths.

In the garden, Amorpha fruticosa suits a wild or naturalistic planting, a streambank, a rain garden, a pond edge, or a tough sunny bank where the fast growth and suckering roots help bind the soil. The summer flower spikes feed bees and butterflies, and the shrub makes a fine screen or backdrop where room allows. Vigorous and free-seeding, false indigo can spread beyond bounds in the wrong place, and sale is restricted in a few states, so site the plant with that enthusiasm in mind and cut back the seed spikes where self-sowing is unwelcome.

Give the plant full sun to part shade and almost any soil, wet or dry, lean or rich, and false indigo asks for nothing more. Prune hard in late winter to keep the open habit in check and to draw out strong new flowering wood, and pull suckers or spent seed spikes to curb the spread. A tough, fast, pollinator-rich native shrub for the difficult, damp, or neglected corners of a large garden.

Will this plant thrive in your zone?

Explore this plant’s medicinal profile
Plant Profile
At a glance
Hardiness
USDA Zones 4–9
Sun
Full Sun, Part Shade
Soil
Moist, Average, Well-drained
Mature size
Height 6–12 Feet · Spread 6–12 Feet
Growth rate
Fast
Seasonality
Deciduous
Design Notes

A tough native for wild, wet, or difficult ground. Set false indigo along a streambank, in a rain garden, at a pond edge, or on a rough sunny bank where the fast, suckering growth binds the soil and the summer spikes feed pollinators. The shrub serves as a screen or naturalistic backdrop where room allows, and as a larval host for native butterflies. Free-seeding and vigorous, with sale restricted in a few states, so give the plant space and cut back seed spikes where spread is unwelcome.

Flower, Fruit & Foliage

Deep blue-purple flower spikes with orange anthers, late spring to early summer

Flowers. Long, slender spikes of tiny deep blue-purple flowers at the branch tips in late spring and early summer, each flower a single folded petal lit by one bright orange anther, alive with bees and butterflies.

Foliage. Soft, ferny, pinnate leaves with many small leaflets, dotted with resin glands and cleanly aromatic when crushed.

Habit. A fast, open, suckering deciduous shrub six to twelve feet tall and about as wide, a nitrogen-fixing legume of streambanks and floodplains.

Care

Read our full care guide

Light. Full sun to part shade; fullest bloom in sun.

Soil. Almost any soil, wet to dry, lean to rich; thrives on streambanks and takes poor ground in stride.

Water. Adaptable, taking both flooding and drought once established.

Pruning. Prune hard in late winter to shape and renew flowering wood; remove suckers and spent seed spikes to limit spread.

Hardiness. USDA zones 4 to 9; deciduous, dropping the leaves each fall.

Medicinal & Traditional Use
Traditional profile
Tradition
Antidiabetic, Anti-inflammatory, Antimicrobial, Antioxidant
Parts used
Seed, Fruit, Leaf, Stem
Active compounds
Amorfrutins, Prenylated benzoic acids, Rotenoids, Isoflavones
Research evidence
3 / 5
Traditional uses
Digestive HealthGeneral WellnessPain ReliefTopical Applications
History & tradition

False indigo bush carries a long ethnobotanical record. Several Native American peoples put the shrub to use: the Seminole took an infusion of the leaves and stems as a general tonic and against rheumatism and chronic sickness, and also for gastric complaints, while the Omaha used the plant to dress wounds. Elsewhere the plant was turned to for stomach pain, intestinal worms, eczema, and neuralgia. The common names false indigo and bastard indigo recall a separate use, as a folk source of blue dye in place of true indigo.

In the modern laboratory, Amorpha fruticosa has drawn real scientific attention. The plant gave its name to the amorfrutins, a family of prenylated benzoic acid compounds concentrated in the seeds and fruits that act as potent, selective PPAR-gamma agonists and have shown strong antidiabetic and anti-inflammatory effects in laboratory and animal studies. Extracts also carry antioxidant, antimicrobial, and glycosidase-inhibiting activity, and the seeds hold rotenoids and other bioactive glycosides long noted for insecticidal properties.

Note. This account is offered as traditional and scientific background only. The uses and compounds described have not been approved for medical use, are not medical advice, and are not a recommendation to consume or apply any part of the plant. The seeds and foliage contain bioactive compounds that may be toxic if eaten, and the research to date is preclinical rather than clinical.

References & research
Please note

These statements have not been evaluated by the Food and Drug Administration. This information is shared for traditional and educational interest only and is not intended to diagnose, treat, cure, or prevent any disease. Please consult a qualified healthcare professional before any medicinal use.

  • Historical and traditional use only
  • Not evaluated for internal human use
  • Seeds and foliage contain bioactive compounds that may be toxic if ingested
  • Contains rotenoids noted for insecticidal activity
Here’s a closer look at how we produce our plants

From rooting to shipping, our top priority is ensuring you receive healthy, thriving plants for your garden’s success.

Woodlanders Growing Process

Because most of our plants are grown from rooted cuttings — alongside seed, air layering, and grafting chosen for each variety — you receive a stronger, true-to-type plant that establishes quickly in your garden.

Sustainable Growing Practices

Raised on organic soil blends and eco-friendly pest management — never harsh chemicals — your plant arrives healthy for your garden, your family, and the pollinators they feed.

Supporting Local Biodiversity

Every purchase gives back. We donate to the Aiken Arboretum and support local wildlife conservation, so growing your garden helps protect the wider ecosystem too.

At Woodlanders, we are committed to quality.
Grown in Aiken, South Carolina
At Woodlanders, we are committed to quality.

All our plant material is carefully propagated, grown, and nurtured at our humble nursery in Aiken, South Carolina.

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Healthy plants, ready to thrive

Your plant arrives carefully packed and ready to settle in. Unpack them promptly, give them a day or two to acclimate, then plant following the notes we include — that’s all it takes. Clear care guidance comes with every order, so success is the easy part.

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Frequently Asked Questions
What to expect upon delivery

All our plants are sold in 1-gallon sizes, though the height of each plant can vary depending on its growth rate and seasonality, typically ranging from 1/2 to 2.5 feet.

Each plant is carefully packaged with its roots enclosed in a secure plastic bag containing moist soil, forming a compact root ball. To ensure safe transport, the box is padded with recycled newspaper, providing both stability and eco-friendly protection from weather during shipping.

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