Ruellia patula is a perennial groundcover that produces annual, spreading shoots, up to 60cm. long, from a woody rootstock. It could also be shrubby. Leaves opposite, ovate, 1-6 cm long and sparsely to densely velvety. Flowers axillary, solitary or 3-5 together. Corolla short-lived, falling in the morning. The white, mauve or purple flowers are quite showy and it makes a lovely groundcover.
Ruellia patula prefers a sunny spot but will be equally happy in semi-shade. The spread is not very extensive, so plant it close together.