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.
The text describes a plant that grows abundantly during the summer months, particularly those older than one year, due to their large underground tubers. In its natural environment of South Africa, Namibia, and Botswana, it goes dormant during winter. However, it may remain green in milder climates.