About packet sizes: For most people, the main difference between small and med/large tubers will be cost. It costs us more to mail large tubers. Even a really tiny tuber has a huge reserve of energy compared to a seed. In favorable climates, a small tuber and a large tuber will probably yield the same amount. This is particularly true if you start the small tubers in pots and plant them out once they are four to six inches tall. Large tubers may perform better in difficult climates or if weeding will be neglected.