What the Iris needs by Byron Tumlinson: With an iris, they should be dug every year and separated and replanted.  They make larger and more colorful flowers this way. Dig them after they die back in the fall, or as soon as they die back in your area.  Also I did not mention, always put about 3 to 4 inches of new compost over the area and work it in before planting.


American Iris Society


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Care of Bearded Iris