Briza media, 2g the seed heads shake in the wind thus giving then their name, can grow up to 70cm tall and prefer dry calcareous soils. other names for these grasses a includes cow-quake, didder, lady's-hair, maidenhair-grass, dithering-grass, doddering dillies, tottergrass,doddle-grass, earthquakes, dodder-grass, jiggle-joggles, jockey-grass, pearl grass, quakers, quakers-and-shakers, wag-wantons