This low perennial is easily recognized by its erect, many-flowered spikes and associated, overlapping, hairy bracts. The square stem has dense, cylindrical, terminal spikes of purple flowers; the tips elongate after flowering. It is often considered a weed of lawns and moist shady spots. A form that flowers when only 2" (5 cm) tall has become common in lawns. Its common name derives from wide use as a herbal remedy for throat ailments.

Its favorite habitat includes moist fields, gardens, pastures, and along woodland edges in Texas's eastern and southern portions. It can be grown almost anywhere, with a little extra water in dry conditions. In scorching areas, give it a spot protected from the hot afternoon sun.