How often can I divide perennials?

FAQ
Question: 

How often can I divide perennials?

Answer: 

The frequency of division depends on the species of plant.  Most fast growing perennials, such as aster, coreopsis, daylily, hosta, and garden phlox, can be divided every 2 to 4 years.  Perennials that spread rather slowly, such as Siberian iris and peony, can be divided every 4 to 6 years.  Some perennials, like false blue indigo and gas plant, don’t like to be divided and should be left undisturbed in the garden.  

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