The cultivar 'Blackberry Jubilee' Iris sibirica 'Blackberry Jubilee' is marbled in shades of red to violet, a color reminiscent of crushed blackberries. The flowers are large, wide and ruffled with darker veins. The stalks stand 36 inches high with 4 blooms on each stalk . Siberian irises lack the “beard” of colored hairs at the base of each fall that other iris groups have . Siberian irises bloom from mid spring to early summer, but the thin, grass like foliage remains a highlight throughout the summer. Typically these irises grow together in thick clumps which 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.