Tropaeolum tuberosum - Limit-2 plants per customer. Perennial vegetable, native to the Andes. Grown for its edible tubers. The leaves and flowers also edible. Mashua is also a very ornamental climbing plant. NB- I have growing plants for sale, grown from cuttings and not tubers,  and the are growing in the greenhouse at this time of year. They will die back if planted outside in cold weather.