Phlox

These tall, eye-catching perennials are ideal for sunny borders. In addition, the large clusters of pink, purple, lavender or white flowers bloom for several weeks in summer, and make excellent cut flowers. Growing hardy garden phlox is simple and so is its general care.

Set out new garden phlox plants in early spring. Choose a sunny location with moist but well-draining soil. Work some compost  into the soil before planting if your soil doesn't manage water well. Give the plants plenty of room, especially in hot, humid areas where air circulation around the plant will help keep powdery mildew to a minimum. Use the recommended spacing on the plant tag, which is usually 18 to 24 inches