Many perennial plants grow in an ever widening clump. After several seasons of growing, these perennial plants will begin to die out in the center and look more like a ring than a clump.
To keep the plants vigorous and blooming, a technique known as 'Division' is performed. Dividing perennial plants gives you healthier, longer lived plants and the bonus of more plants.
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A great time to divide perennials, as long as they are not spring-bloomers.
Many perennial plants grow in an ever widening clump. After several seasons of growing, these perennial plants will begin to die out in the center and look more like a ring than a clump. 
To keep the plants vigorous and blooming, a technique known as 'Division' is performed. Dividing perennial plants gives you healthier, longer lived plants and the bonus of more plants.