While Nectarines resemble peaches, they are sweeter and more nutritious. Best when tree ripened, but they bruise easily so most are picked early. Let ripen for a couple days before use. Avoid nectarines that are too hard or that have green spots, or those that are bruised. Freestone varieties arriving in June and July are generally better than the cling varieties that come later. Substitutes: (One of)peaches, apricots.