Amorpha canescens aka Leadplant

Amorpha canescens, or lead plant, belongs to the pea family. This small shrub sheds its leaves each year. It grows wild across the central United States. Its range includes the Great Plains and the Midwest. It lives in prairies, open woods, hills, and sandy flats. It also grows beside streams where the soil drains well. Fine gray hairs gave rise to its common name. People once thought it marked lead deposits below ground.

Garden plants reach about 1–3.3 feet (0.3–1 metre) tall. Their spread ranges from 2–3.3 feet (0.6–1 metre). Several stems form a dense, rounded or upright mound. The plant can spread through suckers. Young green stems bear white hairs and turn woody with age. The alternate, pinnate leaves have many small oval leaflets. Their dense hairs give them a soft, gray-green look. The leaves also have a scent. In shade, stems may trail toward a sunnier spot.

Small blue-purple flowers crowd spikes at the branch tips. Bright yellow or orange anthers stand out against the petals. Sources differ on the season of bloom. NC State reports May and June. Missouri Botanical Garden gives July through September. RHS places bloom in late summer and early autumn. Small, hairy pods follow the flowers, though fruit is sparse. These pods change from green to dark brown as they ripen.

Full sun suits this plant best, though it tolerates some shade. Give it soil that drains well. Sandy or rocky ground suits it, but clay and loam also work. It grows in acid, neutral, or alkaline soil. It tolerates drought, poor soil, and dry sites. Roots can reach 4 feet (1.2 metres) deep or more. These roots help it survive prairie fires. As a legume, it adds nitrogen to the soil. Sources rate it hardy in USDA zones 2–9 and UK H7.

Use lead plant in meadows, prairie beds, or wildflower gardens. It also fits borders and gravel gardens. Its roots help hold soil against erosion. Birds and butterflies visit it, and native bees benefit from it. Deer, rabbits, and other mammals may browse the plant. Care needs are low, with few serious pest problems. Leaf spots, rust, powdery mildew, and canker can still occur. Dried leaves make tea with a yellow tint. Plants For A Future reports no known hazards. That report does not establish pet safety. It also records folk uses for wounds and stomach pain. Those records do not prove that these treatments work.