1. Distinguish the difference between iron stick medicine and vegetable yam from the external aspect: iron stick yam is unique to rust erythema, but vegetable yam is not. The head of iron stick yam is round, and the whole body hair is uniform, while the vegetable yam is mostly pointed with little hair and uneven thickness.
2. judging from the taste characteristics: cut an incision, and judge by the liquid of the cut surface, the liquid of iron stick yam is a little sticky, and the liquid of vegetable yam is very thin. After cooking, the semi-cooked iron yam tastes a little crisp and sticky, and the vegetable yam tastes a little similar to cucumber. Iron yam can't be cooked rotten, but Caicai yam can be cooked very soft.
3. the difference between iron stick medicine and vegetable yam: the nutritional value and medicinal value of vegetable yam are far lower than that of iron stick yam, and it is generally only used for general cooking.