'Tumble Bug'  has spectacular double flowers of royal purple . It has 32 petals with yellow signals surrounded by a white halo.   It stands 34 inches high and blooms in mid season. Siberian irises lack the “beard” of colored hairs at the base of each fall that other iris groups have. Typically these irises grow together in thick clumps which keep out weeds, while the thin, grass like foliage remains a highlight throughout the summer. The classic 'Fleur de Lys' which has been a symbol of royalty throughout history was an adaptation of the iris flower. The name Iris was taken from the Greek goddess of the rainbow to symbolize the many colors of this flower.