Phlox pilosa aka Prairie Phlox

Phlox pilosa is a perennial in the phlox family, Polemoniaceae. Its common names include downy phlox and prairie phlox. Its native range runs from southeastern Canada to northern Mexico. It grows across much of the eastern and central United States. This wildflower forms upright clumps and loses its leaves each year. Rhizomes help the clumps spread into nearby ground.

Garden plants often reach 1–2 feet [0.3–0.6 metres] tall. Their spread is about 1–1.5 feet [0.3–0.46 metres]. RHS lists larger heights and spreads, reaching 3.3 feet [1 metre]. Soft white hairs cover the green stems and many leaves. The deep green leaves grow in opposite pairs without stalks. Each has a pointed tip and a clear central vein. Lower leaves are narrow, while upper leaves are lance-shaped. Their edges are smooth, and fine hairs give a soft feel.

Loose flower clusters form at the tips of the stems. The scented blooms range from pink to pale purple. Each flower has a long tube and five flat lobes. Soft hairs often cover the outside of the tube. Bloom runs from May through July, sometimes returning in fall. Bees, butterflies, and skippers visit the flowers; hummingbirds also visit. Small, papery seed capsules follow the blooms in summer. These oval fruits split into three parts when dry. They burst open and scatter their seeds.

Grow downy phlox in full sun or partial shade. Give it fertile soil that drains well. It accepts clay, sand, loam, and shallow rocky ground. Moist soil suits it, but it also tolerates dry spells. Summer mulch helps keep the root zone cool. Sources rate it for USDA zones 4–9 and UK H5. Its growth rate and maintenance needs are moderate. Spreading clumps may need control near other plants. Propagate it by seed or by stem or root cuttings.

Use it in meadows, borders, rock gardens, or prairie plantings. Its fragrant flowers also suit cutting. Serious pest and disease problems are uncommon. It resists powdery mildew, though hot, dry weather can encourage spider mites. Rabbits, deer, and groundhogs may eat its leaves. Meskwaki people used its leaves and roots in traditional remedies. Those records do not establish food use or safety.