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Iris need to be thinned or divided before they become overcrowded, generally every 3-5 years. If Iris are allowed to become too crowded the bloom will suffer, some varieties may crowd others out and disease problems may be aggravated. Depending on your location, July through September is the time to divide and transplant Bearded Iris.

Transplanted Iris should be planted a minimum of six weeks before the first hard frost in your area.

Old bunches might be diminished via painstakingly removing the old divisions at the focuses of the clusters and leaving new development in the ground. On account of exceptionally old and compacted bunches, the way toward diminishing may be less demanding in the event that you uncover the whole cluster, expel the old "spent" rhizomes, trim the foliage of the new rhizomes and