The cultivar Butter & Sugar has creamy white standards and pale butter yellow falls. It blooms in June and may rebloom. It stands 28 inches high with thin, grass-like foliage that remains a highlight throughout the summer . 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 that keep out weeds. The name iris was taken from the Greek goddess of the rainbow to symbolize the many colors of this flower. The classic Fleur de Lys, which has been a symbol of royalty throughout history, was an adaptation of the iris flower.