Research conducted on diverse sweetpotato germplasm showed that some genotypes form their roots at the same time, that are of the same maturity (discontinuous storage root formation and bulking) and other continue to form roots over time (continuous root forming), which aligns with the traditional practice of piecemeal harvesting. The genetic control of these two types is different and their cross combination permitted transgressive segregant progenies, which may form the basis for developing superior varieties. Molecular markers, as well as putative genes for the two types of growth have been discovered and will serve as foundation knowledge for accelerating breeding for the traits through marker-assisted selection.