What do “clingstone,” “freestone,” and “semi-freestone” mean?
These words describe the interaction of a stone fruit’s flesh and its pit. Peach, plum and nectarine varieties can be clingstone, freestone or semi-freestone. In clingstone varieties, the flesh holds fast to the fruit’s pit, while the flesh of freestone varieties is easily separated from the pit. In semi-freestone varieties, the fruit’s flesh easily separates from the pit when the fruit is fully ripened.