The many varieties of phlox reach a height of from 1 to 4 feet and bear flowers in a wide variety of colors. They prefer a fertile well-drained soil with a constant supply of moisture. Wide spacings help control disease problems and maintain maximum flower size.
Full sun is preferred but light shade is acceptable.
Cut back old flower stems to prolong the blooming period. Dieback occurs if plants are not divided often enough. Removal of weak shoots enhances flowering on stronger shoots. Propagation is by seed, root cuttings, division and softwood cuttings. The seed germinates in 3 to 4 weeks at 70 degrees but needs darkness.