A step by step process of how to divide perennials. As an added bonus the is a clickable list of different perennials explaining which ones do not like to divided, ones that prefer to be divided every 3 to 5 years and perennials that need to be divide every other or three years to keep growing healthy.
Perennials, especially small flowering plants, that grow and bloom over the spring and summer, die back every autumn and winter, and then return in the spring from their root-stock. Better Homes and Gardens website shares the info.
How to Divide Perennials Flowers: