Flower-of-an-hour, Stundenblume, Hibiscus d’Afrique. Easy-to-grow annual with a long flowering season. Although the flowers last just a couple of hours, the plants produce continuously new ones from spring till late summer. The plants grow upright, branches well and have dark green divided leaves. Flowers are 5 cm / 2 in. wide, pale yellow with a dark purple throat and golden-yellow anthers.