Pycnanthemum pilosum. Rhizomatous plant with tiny, mint flavored, light green leaves that turn almost white as the plant matures. White to lavender flowers bloom in flat, tight clusters. Caution: not for use by pregnant women; may be harmful to the fetus. Great for herb or wild gardens. Grows 2-4' tall and wide. Blooms in summer. Full sun to part shade. Needs well-drained soil. Perennial