People grow sweet potato in many parts of the world, including New Zealand, Australia, the Philippines, Japan, Hawaii, China, and North America.
[2] People breed sweet potatoes mainly either for food (their nutritious storage roots) or for their attractive vines.
Sweet potato plants with desirable traits are selectively bred to produce new cultivars.
A yam tuber is starchier, dryer, and often larger than the storage root of a sweet potato, and the skin is more coarse.
An agricultural experiment station (AES) is a research center where scientists work to increase the quality and quantity of food production.