Wild Blue Phlox, also known as Louisiana Phlox, Blue Woodland Phlox, and Sweet William, is a perennial, semi-evergreen plant that grows 10 to 20 inches tall with opposite, unstalked, hairy leaves. The fragrant, bluish-lavender, light purple, pink, or white flowers appear in early summer and provide a nectar source for butterflies and hummingbirds. Wild Blue Phlox grows in partial to full shade and rich, moist, acid soils, including sandy, loamy, and clayey soils.