Four o'clocks are tuberous, tender perennials with flowers that may have magenta streaks, but this collection is predominantly yellow. The flowers open in the late afternoon, typically around 4 p.m. or so, and then remain open until the next morning.

Direct sow after frost, or start indoors 6-8 weeks earlier, pressing lightly into the soil since they need light to germinate. Tubers may be dug and stored over winter. Will self-seed.