Description Panicum virgatum ‘Heavy Metal’ Switch Grass. A dense, upright, deciduous perennial grass which forms clumps of flat, linear, arching, blue-green leaves which turn yellow in autumn. In early autumn weeping panicles of tiny, red-purple flowers are borne. Grow in moderately fertile, well-drained soil in full sun. It will reach a height of 1.3m and a spread of 60cm.
