Briza media aka Perennial Quaking Grass

Briza media, or common quaking grass, belongs to the grass family. This perennial grows in temperate parts of Europe, Asia and Africa. Its native range includes Macaronesia and north-west Africa. It extends across Europe to Siberia and Iran. It also reaches the Himalaya, south-central China and northern Myanmar. The species is native to Britain and Ireland. Gardeners grow it for its moving flowerheads and upright form.

Narrow leaves form clumps that spread through creeping rhizomes. The foliage is green to blue-green and partly evergreen. Leaf clumps stand about 1–1.25 feet [0.30–0.38 metres] tall. Flower stems rise well above them in spring. These reach about 2–3 feet [0.61–0.91 metres] in height. RHS gives an upper height of 3.3 feet [1 metre]. Clumps spread about 1.5–1.6 feet [0.46–0.50 metres] across. Plants take two to five years to reach full size.

Small green flowers appear in loose panicles during May and June. Slender stems hold the nodding flowerheads clear of the leaves. The heads have a flattened, heart-like shape and purple tints. As seeds develop, their colour shifts towards tan or buff. Fine stalks let the heads shake in light winds. This movement gives the plant its common name. The flowers provide interest above the lower clump of leaves.

Grow this grass in full sun with soil that drains well. It accepts chalk, clay, loam and sand. Acid, neutral and alkaline soils all suit it. Sources describe suitable moisture as dry to moist, with moderate watering. Choose a sheltered site where possible. Hardiness ratings are USDA zones 4–8 and RHS H7. Despite its cold tolerance, it does not tolerate hot summers well. Care needs are low, and seed offers a means of propagation.

Plant groups in meadows, informal gardens or areas left to naturalise. It also suits beds and borders, though spread may become weedy. RHS lists it for cut flowers and courtyard gardens. Neither RHS nor Missouri Botanical Garden reports major pest or disease concerns. Pruning is not essential. Cutting spent heads in late summer can prompt fresh growth. Clear dead leaves in late winter, or cut clumps in late autumn. Missouri Botanical Garden also lists tolerance of black walnut.