Parahebe catarractae is an evergreen, decumbent, or erect subshrub. The green, toothed, spear-shaped leaves are 1–4 in (2.5–10 cm) long. The white flowers are veined pink or purple, 0.25–0.5 in (0.6–1.2 cm) in diameter. It is hardy in the UK.
Parahebe catarractae grows beside streams, on cliffs and rocky places in lowland to mountain areas of North Island, South Island, and Stewart Island, New Zealand. A variable plant with several forms in cultivation.