Growing Garden Phlox (Phlox paniculata, P. carolina, P. maculata)

Pronunciation: floks

This valuable genus includes reliable, colorful species blooming early and late, in sun and shade, with a rich color range. Most phlox prefer full sun (partial shade in the South) and moist, well-drained soil.

P. divaricata laphamii excels in partial shade with well-drained, organically enriched soil and slightly acidic to neutral pH. Its informal habit and rooting stems allow it to form ground cover where conditions suit. Cut flowering stems to the ground after bloom for tidiness.

P. paniculata and, to a lesser extent, P. carolina and P. maculata are susceptible to powdery mildew, especially in dry soil. Water deeply during dry spells to reduce disease, and dust with sulfur (garden centers) starting in early summer. Thinning half the shoots when 6 inches tall in spring improves air circulation, reduces mildew, and encourages larger, longer-lasting flower heads.

Divide P. paniculata every few years, replanting outer sections and discarding the woody center.