Sweet William has been grown in European gardens for centuries, and the genus name barbatus — meaning bearded — refers to the fringed or bristle-like appendages emerging from the petals, a small detail that repays a close look. Grown as a biennial or short-lived perennial but most commonly treated as an annual, it produces flat-topped clusters of flowers in a range of colors from pure white through intense crimson and purple, often with striking bicolor or picotee patterning. The fragrance is gentle and clove-like, strongest in the morning.

It grows best in loamy, slightly alkaline soil with good drainage, in full sun or partial shade — particularly welcome in climates with hot summers where afternoon shelter helps it through the worst of the heat. Crown rot and rust are the primary disease concerns, both tied to poor drainage or overcrowding. Deadhead regularly to extend the bloom period, and expect self-seeding if conditions are right. The dense flower clusters make useful cut stems, and the plant is a traditional component of cottage and kitchen garden borders where it mingles easily with taller perennials.