This undated photo shows a clump of irises being divided in New Paltz, N.Y. Overgrown clumping perennials such as iris can be rejuvenated and brought down to size by dividing the clumps into smaller ...

NewsWorks reader Judy is redoing a sidewalk garden, and she wrote in to ask for some recommendations for hardy plants that would have some endurance and enhance her streetscape. We’ve got some answers ...

As clump-forming perennials mature, they often become overcrowded, competing among themselves for light, water and nutrients. This typically results in fewer blooms, said David Trinklein, state ...