Bottlebrush grass, Elymus hystrix, brings soft texture and movement to woodland borders and lightly shaded native plantings. You will see upright clumps of narrow green blades, followed by airy, bristly seed heads that look like delicate bottlebrushes in summer. Mature plants typically stand about 30 to 36 inches tall and spread about 12 to 18 inches, creating an open, natural look that mixes well with ferns, spring ephemerals, and shade perennials.
Place it where it will get dappled sun or partial shade. It can handle the root competition common under trees and is often happiest where the soil stays moderately moist, though established plants can tolerate dry periods. In very hot, dry summers it may go quiet or look tired; a bit of mulch and occasional watering during prolonged drought helps it stay present and attractive.
Let the seed heads age on the plant for added seasonal interest and to provide food for birds. If you prefer a tidier appearance, cut back stems in late winter before new growth starts. This is a clumping grass that may self-sow lightly in favorable conditions, so you can leave some seed heads in place and trim others. Divide clumps in early spring if you want to increase your planting or refresh an older stand.