How to Save Creeping Phlox That Are Dying

Move the creeping phlox to a sunny location, if it is sitting in partial shade. Creeping phlox need at least six to eight hours of sunlight daily to thrive. Add compost to the soil to improve soil texture and drainage. Wet, soggy soils promote root rot.

Divide phlox every three to four years to encourage new growth. Dig up the plant in the spring, and cut it with a shovel or sharp knife to divide the roots. Replant the pieces at least 12 to 18 inches apart. Cut phlox back after flowering to encourage more blooms and to keep the plant looking neat and trim. Sometimes, a phlox that appears to be dying merely needs a good pruning.

Fertilize the plant in spring with a balanced fertilizer before new growth starts. Creeping phlox can tolerate infertile soil, but if growth lags, a shot of fertilizer can bring new life to the plant.

Treat fungal diseases, such as powdery mildew, leaf spot, and stem blight, with a fungicide in the spring. These diseases usually aren't fatal to creeping phlox, but they may slow growth and reduce vigor. Clean up plant debris to prevent the spread of diseases, and avoid wetting the leaves when watering, which can promote disease.

Mulch the creeping phlox with 2 to 3 inches of wood chips or bark. Mulches conserve moisture and regulate soil temperature. Water creeping phlox as needed to keep the soil evenly moist, but not soggy.