Most phlox need to be divided every two to four years if they're growing well. The best time to do divide and transplant is in spring, before new growth begins. Each division should consist of three to five vigorous shoots with roots attached.

How do you divide and transplant phlox?

Garden phlox (Phlox paniculata) can be divided in spring or late summer/early fall. In spring, dig up the plants just as new growth begins to appear. Divide each clump into sections with a sharp knife. Each division should contain at least 2 or 3 shoots and a portion of the root system.

Is it easy to transplant phlox?

The easiest of the phlox propagation methods is called division. To accomplish this, you essentially dig up a plant, separate it into several sections, then set each in a new location. ... Each section can be treated as a new plant, to be transplanted to a new location. There it will grow and spread to cover bare land.