Brizamedia, 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 include 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 and wag-wantons.