A freestone peach is one where the flesh (mesocarp) separates from the stone (endocarp). When the fruit is cut in half, there is easy separation at the pit and the pit can be removed by hand. It may even fall out if you tip the cut fruit over. Freestone peaches are popular for home canning because their ease of preparation. Clingstone peaches have flesh that clings to the stone. When the fruit is cut in half, it is very difficult to separate the two halves because the flesh is stuck in the pit. For commercial canning of nonmelting flesh clingstone peaches in California, machines are used to cut/separate the fruit.