The native iris hexagona giganticerulea can survive in 0 to 10 parts per thousand of salt and can tolerate pulses up to 22 parts per thousand for brief periods. . These native Louisiana Irises are a mixture of light blue and light purple and grow to about four feet in height. They are the hardiest of all the irises. PRICE IS FOR 100 PLANTS ($4.50 PER PLANT)