While there are numerous varieties of nectarines, the differences are not easily distinguishable for most consumers. The biggest difference is colour: nectarines can be divided into two categories: white flesh and yellow flesh. Nectarines can also be characterized by their pit. Freestone varieties have flesh that separates easily from the pit, while the flesh of a clingstone variety clings to the pit.
Yellow nectarines should be eaten when soft and juicy, when they yield slightly to gentle palm pressure. White flesh nectarines are a bit different. They are sweet when still firm and crunchy and can either be enjoyed that way or allowed to soften. It’s just a matter of personal preference.