Iberis sempervirens Fischbeck is a compact evergreen subshrub which forms mounds of short narrow dark green leaves, which in late spring and early summer are covered with rounded heads of pure white flowers. Also known as perennial candytuft this plant can grow to 15cm high , but responds well to cutting back after flowering to maintain size and shape. Ideal for large rockeries or the front of a perennial border in any sunny or partially shaded site in well drained soil.