Koeleria macrantha aka June Grass

Koeleria macrantha is a grass known as prairie junegrass. It belongs to the grass family, Poaceae. Its native range spans the temperate Northern Hemisphere into Mexico. It grows across much of the United States, Europe, and Asia. It is absent from parts of the northeastern and southeastern United States. Wild plants grow in dry prairies and open woods. Other habitats include sandy ground and pastures over chalk or limestone.

This cool-season grass forms small, upright clumps. Garden plants reach about 1.7–2 feet [0.51–0.61 metres] tall. Clumps can spread to about 1.5 feet [0.46 metres]. Sources describe garden plants as perennial, though Kew also records annual forms. Most leaves grow near the base of the plant. They reach about 0.6 feet [0.18 metres] in length. Their green colour may have a grey tint. Narrow flower clusters rise well above the leaves in late spring. These tapered clusters reach about 0.4 feet [0.13 metres] long. Green blooms appear in May and June.

Grow this grass in full sun with very good drainage. It suits dry to moderately moist soil and tolerates drought. Rocky or gritty ground gives it suitable growing conditions. Avoid shade, wet ground, and heavy soils. Chicago Botanic Garden lists USDA hardiness zones 3–9. Cold tolerance can vary with the source of the seed. Plants may turn dormant during hot, humid summers. In cooler summers, the foliage can stay attractive into autumn. Individual plants may have a short life.

Prairie junegrass suits meadow plantings and groups of ornamental grasses. It also works in beds and borders. Summer dormancy can leave gaps in a prominent border. It can sow itself where conditions suit it. Use this trait where extra seedlings will not cause problems. Seeds can establish large plantings when scattered on the ground. Spring sowing and spring division offer ways to raise new plants. Care needs are low. Major pest and disease problems are uncommon. Rust, leaf spots, and blights can occur.

The seeds have recorded food uses after cooking. Ground seed can make porridge or flour for bread. Plants For A Future reports no known hazards. It also records use of the plant to help stop bleeding from cuts. Bundled leaves have served as brushes, brooms, and pan scourers. Straw has helped bind adobe used for walls.