Ruellia cordata is a small shrublet, up to 30cm,  that sprouts annually from a woody rootstock. Stems are 4-angled, branching from near the base. The leaves clasp the stem and is heart-shaped. The solitary axillary flowers are quite large and the hairy, heart-shaped leaves add to the charm. Colour varies between purple-blue, mauve, pinkish or white. It can be used with great effect as a groundcover.

Ruellia cordata stays compact and looks very attractive on a rockery, interplanted with small grasses. It id very hardy and drought-tolerant. Flowering season is quite long.