The cultivar Dewful has medium-blue flowers with distinctive white blazes. The rigid stems stand 3 to 4 feet high, taller than most Siberian irises. It blooms in late spring with narrow grass-like leaves that remain 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 which keep out weeds. The name ris 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.