Nectarines come from the peach family, both of which are types of stone fruits. A stone fruit, or drupe, is classified as a fleshy fruit usually having a single hard stone (pit) that encloses a seed. Most stone fruits are harvested in the summer between May and August. Unlike peaches, nectarines have a smooth, fuzz-less skin and can have white or yellow flesh. When ripe, nectarines have a much creamier and sweeter flavor than most peaches do. Contrary to many beliefs, nectarines are not a cross between a peach and a plum.