Sporobolus heterolepis aka Northern Dropseed

Sporobolus heterolepis is a perennial grass called prairie dropseed. It belongs to the grass family, Poaceae. Its native range spans Canada and the United States. It grows in prairies, glades, open ground, and along railroads. This warm-season grass forms dense clumps and grows slowly. Plants can live for many years once they settle in. Some eastern states list it as endangered, including North Carolina.

Garden plants reach about 2–3 feet [0.6–0.9 metres] tall and wide. The RHS gives upper limits of 3.3 feet [1 metre]. The leafy mound sits lower than the flower stems. Narrow leaves arch out from the centre of each clump. Their fine texture gives the plant a soft outline. Leaves shine green in summer, then turn yellow or orange. Later, they fade to copper or pale brown. The dead leaves still add shape through winter. Snow does not flatten the clump. Fibrous roots and short rhizomes form its root system.

Slender stems carry loose panicles of small pink-brown flowers. Bloom can run from July to October, depending on location. The flowers have a scent compared with popcorn, wax, or coriander. Their heads turn golden brown as the season ends. Seed heads can stay on the plant into winter. Small brown seeds fall from their hulls in autumn. This seed drop explains the plant's common name. Sparrows and juncos eat the seeds. The grass also feeds grasshoppers and leafhoppers. Native Americans ground the seeds into flour.

Give prairie dropseed full sun and soil that drains well. It accepts some shade but prefers a sunny site. It grows in dry to moderately moist soil. It tolerates sand, loam, clay, and shallow rocky ground. Acid, neutral, and alkaline soils all suit it. It withstands drought, deer, urban conditions, and nearby black walnut. Sources place it in USDA zones 3–9 and RHS H7. Keep nearby plants from crowding its slow-growing clumps. Cut old growth close to the ground in spring.

Use it in borders, meadows, rock gardens, or slope plantings. Mass plantings can serve as ground cover in dry sites. Its roots help limit erosion. It also suits containers and the upper edge of rain gardens. Serious pest and disease problems are uncommon. It does not seed freely in gardens. Seeds can be hard to germinate, so division is easier.