Peach

Peach is a stone fruit: skin, flesh, pit. Ripe flesh is perfume; overripe flesh is mush. For preserving, pectin is the weak corner.

Ohio State places peaches in the group that always needs added acid, pectin, or both ¹. The same fact sheet’s no-added-pectin jam table pairs peaches with bottled lemon juice. Lemon is there for gel, not garnish. See Pectin and Jam.

Jam identity. 21 CFR 150.160 lists peach among Group II fruits ². Pit weight is excluded from the fruit weight in that standard.

Not jam. NCHFP: traditional Southern preserves of whole or uniform fruit in a very thick sugar syrup — usually figs, peaches, or pears — are not jam or pectin gel. Sugar is required for those published short processes; without it you have left that product ³. That product is Preserves. Fig is the neighbor fruit. Sugar is structure in that syrup, not a preference. Ordinary canned peaches follow fruit-canning directions, not that preserve.

What to notice. Smell at the stem; give at the shoulder. A pretty, hard peach is underripe for eating and still not a pectin strategy. Freestone versus cling is a pit, not a gel.

Canning for the jar. Do not invent a water-bath time for an untested peach jam.