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How to divide dwarf iris
Choose the correct time to divide the rhizomes of the dwarf iris.
Divide irises during the summer dormancy period into early fall, at least 6 weeks after the last blooms have faded. This gives the newly formed rhizomes time to become established.
Irises should be divided every 3 to 4 years or when the middle of the clumps look bald. Irises may indicate they need divided when the amount of blooms decrease from year to year.