Amsonia tabernaemontana aka Texas Star

Amsonia tabernaemontana is a perennial in the dogbane family. Gardeners call it eastern bluestar or blue star. It comes from the central and eastern United States. Wild plants grow in woods, thickets, fields, and along streams. They also occur on slopes and beside ditches. The plant forms an upright clump with many leafy stems. It grows slowly and sheds its leaves each year.

Garden plants reach 2–3 feet (0.61–0.91 metres) tall and wide. RHS gives heights up to 3.3 feet (1 metre). Its spread estimate is smaller: 0.3–1.6 feet (0.1–0.5 metres). Narrow green leaves give the clump a fine texture. Their shape recalls willow leaves, though some are more oval. The leaves can turn yellow or gold in fall. Cut or torn leaves and stems release white latex. This toxic sap helps protect the plant from grazing animals.

Pale blue flowers form clusters at the tips of stems. Each star-shaped bloom measures about three-quarters of an inch across. Flowering starts in late spring, often during May and June. RHS reports that blooms may last into mid-summer. Butterflies, carpenter bees, hummingbird moths, and hummingbirds drink the nectar. Long, pod-like fruits follow the flowers and hold hard black seeds. Gardeners can use these seeds to raise new plants. Seed-grown plants do not bloom until their second year.

Grow eastern bluestar in sun or part shade. It prefers moist soil that drains well, with loam a good choice. It also grows in clay, sand, and chalk. It accepts acid, neutral, or alkaline soil. Established plants can cope with some drought and brief wet spells. Shade or rich soil may cause stems to lean. Staking or trimming after bloom can help keep clumps neat. RHS advises cutting stems back in late autumn. Sources list USDA zones 3–9 and UK hardiness H5.

Use it in borders, cottage gardens, or open woodland plantings. Groups suit native gardens, pollinator beds, and rain gardens. The flowers also suit fresh-cut arrangements. Deer tend to leave the plant alone. Pest and disease trouble is limited, though rust can occur. Gardeners can divide dormant clumps in spring or fall. Remove spent blooms to limit self-seeding. Do not eat the plant; RHS warns it harms people and pets. Wear gloves and protective clothing when handling it.