Fockea angustifolia is a climbing, perennial, succulent plant producing several stems from a tuberous rootstock. The stems can be erect or climbing, supporting themselves by twining around other plants. The caudex can grow to 25 centimetres in diameter and 40 centimetres long, the vines can reach one and a half meter. The flowers are from greenish to white, and vary in size, depending on the origin.
The plant is harvested from the wild for its large, edible root, which is eaten locally.