Wahlenbergia rivularis is a perennial herb with white or creamy summer flowers. The plant spreads in groundcover fashion, rooting as it multiplies. In bloom it reaches about 30 cm in height. It is evergreen, thriving to some extent in sunny, but more commonly in semi-shade positions with regular good watering. It is commonly and fairly easily grown from seed or cuttings. The natural habitat of the species is close to watercourses and marshy areas, where such conditions prevail in various parts of South Africa.
Wahlenbergia rivularis leaves are broadly elliptic to ovate with shiny upper surfaces and marked indentations along the curved lines of the net-veining. The edges vary between being entire and slightly toothed. The flowers are bell-shaped with five petals that have pointed tips and are joined at the base. They grow on long thin stems well above the foliage (www.plantzafrica.com).