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Baptisia tinctoria

eastern wild indigo

Fabaceae Eastern North America

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant

Native to North America

SunFull Sun – Part Shade

WaterLow · drought-tolerant

HardinessZones 3–9

Overview

Baptisia tinctoria, yellow wild indigo, is a bushy perennial legume of dry, open ground in eastern North America, forming a rounded mound 24–36 inches (60–90 cm) tall and about as wide. Its slender, much-branched stems carry small blue-green leaves divided into three rounded leaflets, each 0.5–1 inch (1.5–2.5 cm) long, giving a clover-like texture. In early to midsummer short upright clusters of yellow pea-shaped flowers about 0.5 inch (1.5 cm) long open near the branch tips. The flowers are followed by small, inflated seed pods that ripen to black and rattle when dry. The plant grows from a deep, woody taproot that makes it drought-tolerant but slow to establish and difficult to move once settled. All parts contain quinolizidine alkaloids that can cause digestive upset if eaten. It grows in sandy and rocky soils of dry woodland edges, clearings, and barrens, and it fixes nitrogen through its roots. The whole plant often blackens after frost and was once used as a source of blue dye.

Native Range

Baptisia tinctoria is native to eastern North America, from Maine and Ontario south to Florida and Louisiana and west to the Mississippi River. It grows in dry, sandy, and rocky soils of open woodland, clearings, barrens, and roadsides.

Suggested Uses

Used in dry meadows, native and pollinator gardens, sandy borders, and naturalized plantings. Its deep roots suit poor, sandy soils and slopes, though its slow start and dislike of transplanting make it less suited to frequently rearranged beds.

How to Identify

Recognized by a rounded, much-branched habit, blue-green leaves of three small rounded leaflets, and short clusters of yellow pea flowers in summer. Inflated pods ripen to black and rattle with loose seed. The small three-part leaves and shrubby form separate it from the larger blue-flowered Baptisia australis.

Appearance

Size & Dimensions

Height2' - 3'

Width/Spread2' - 3'

Colors

Flower Colors

yellow

Foliage Colors

green

Fall Foliage Colors

no change

Bloom Information

Bloom Period

~4 weeks

Summer

Flowering occurs in early to midsummer, roughly June and July. The yellow pea flowers open in short upright clusters at the branch tips over a few weeks. Inflated seed pods follow and darken to black as they dry.

Detailed Descriptions

Foliage Description

Blue-green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.0 - 6.5(Acidic)

357912

Soil Types

sand loam rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

3-4 years to full size

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Grows in full sun and dry, well-drained sandy or rocky soil at a pH of about 5.0–6.5. Water needs are low, and the deep taproot makes established plants drought-tolerant. It is hardy in zones 3–9 and resents being divided or moved once settled. It needs no fertilizer, fixing its own nitrogen, and may take three to four years to reach full size. Plants are usually raised from seed sown in place because of the brittle taproot.

Pruning

Little pruning is needed. The stems can be cut to the ground in late fall or left standing for the rattling pods through winter. Shearing lightly after bloom keeps the mound compact but removes the developing pods.