Summer growth is typically prodigious, particularly in plants older than one year, due in part to its large underground tuber. The plant is dormant over winter in its native home — South Africa, Namibia and Botswana — but might possibly remain evergreen in less harsh environments.
Plants that grow during the summer are especially prolific, particularly those that are more mature, thanks to their large underground tubers. In their natural environment of South Africa, Namibia, and Botswana, they go dormant during winter. However, they may stay green in milder climates.