Ipheion uniflorum aka Springstar

Ipheion uniflorum, or spring starflower, is a bulbous perennial. It belongs to the amaryllis family, Amaryllidaceae. Its native range runs from north-central Argentina to Uruguay. It forms low clumps that spread when left alone. New bulbs and self-sown seedlings help it form larger patches. Its fast growth suits areas where spreading plants have room.

Garden plants stand about 0.5–0.8 feet [0.15–0.25 metres] tall. Published height ranges extend to 1.6 feet [0.5 metres]. Individual clumps spread about 0.3–0.5 feet [0.1–0.15 metres] across. The narrow, blue-green leaves grow from the base. They reach about 0.8 feet [0.25 metres] in length. Their smooth, glossy blades have a slight waxy bloom. Bruised leaves give off an onion or garlic smell. Leaves can emerge in winter, sometimes as early as autumn. They die back as the plant enters late-spring dormancy.

Each bulb sends up several stems, each bearing one flower. The stems rise about 0.5–0.7 feet [0.15–0.2 metres]. Flowers open in early to mid-spring, with April bloom reported. Their shades range from near-white through pale blue to violet-blue. Each flower has six spreading segments joined at the base. A dark line marks the centre of each segment. The flowers have a light, spicy scent. They also serve as cut flowers.

Grow this bulb in sun or light shade. A sheltered site with good drainage suits it well. It accepts acid, neutral, and alkaline soil. Sources report broad soil tolerance, including clay and rocky ground. Keep soil moist during active growth, though plants tolerate drought. Plant bulbs in autumn. Sources differ on planting depth, so no single depth fits all guidance. USDA hardiness spans zones 5–9; the RHS rates it H5. In colder sites, the RHS advises winter mulch. Plants need little care and no pruning. Divide dormant clumps in summer, or raise plants from seed.

Use it along paths, at border edges, or among rocks. It also suits lawns, woodland gardens, containers, and shrub underplanting. Mass planting makes the small flowers easier to see. Allow for its quick spread when choosing a site. Slugs and snails may cause damage. Sources report few serious insect or disease problems. The supplied evidence does not establish edibility or toxicity.