A spreading perennial with showy, cup-shaped flowers that are initially white and mature to pink with darker pink veining. It has toothed, lance-shaped, green leaves and produces fragrant flowers from late spring to fall, though in cooler climates they may open later in the day. This plant is drought-tolerant, grows well in poor or sandy soil, and is best planted where its aggressive spreading can be contained, like a rock garden or a meadow. It typically grows 10 to 24 inches tall. The plant spreads vigorously by rhizomes and seeds, forming large colonies, and is best suited for containment.