Most perennials are easy care plants that require less maintenance than annuals and return year after year with minimal fuss.

However, after several years the clumps will run out of steam and die off in the middle, leaving plants that are reluctant to flower. Fortunately it's easy to revive them. Irises spread by ...

A prime example of needing to divide is ornamental grasses. As they continue to grow, the center of the grass becomes shaded and unproductive. Removing a portion of the grass keeps it attractive and ...