Canning FAQ

A canner with a rack, jars, new flat lids, a jar lifter, a funnel and a tested recipe. For a first harvest that almost always means a water bath canner. Full list in what equipment do you need for canning.

A water bath canner, in almost every case. It covers jam, jelly, pickles, fruit and acidified tomatoes, which is most of what a first September produces, at a fraction of the cost. See water bath vs pressure canning.

For high-acid foods, often yes. It needs to be deep enough to keep an inch of briskly boiling water over the jar tops, and you need a rack. See canning without a canner.

A small batch of jam from a tested recipe. Short processing time, high acid, and you find out quickly whether your seals worked.

A water bath canner, a case of pint jars, lids and a jar lifter is the entry cost and it is modest. Jars last decades; the only true consumable is the flat lid.

High-acid foods at pH 4.6 or below: jams, jellies, pickles in vinegar, most fruit, chutneys, tested salsas, and tomatoes acidified with bottled lemon juice or citric acid. Full list in what can you water bath can.

Every low-acid food: green beans, corn, carrots, potatoes, beets, peas, all meat, poultry and fish, stocks and soups, dried beans, and plain tomatoes with no added acid. See what foods need pressure canning.

No. Green beans are low-acid, boiling water cannot exceed 212°F however long it runs, and botulism spores survive that temperature. They require a pressure canner. This is the most dangerous misconception in home canning.

Only without added acid. Tested recipes acidify tomatoes with a specified amount of bottled lemon juice or citric acid, which makes water bath processing safe.

Bottled juice has a standardized acidity; a fresh lemon's varies. When the acid is the safety margin, the standardized one is the one to use.

Yes, when the method matches the food's acidity and a tested recipe is followed exactly. The serious risk is narrow and comes from one failure: low-acid food processed without a pressure canner. See is home canning safe.

No. A boiling water bath reaches 212°F and the spores survive. In high-acid foods the acidity prevents them growing; in low-acid foods only a pressure canner at about 240°F destroys them. See botulism and home canning.

You cannot, reliably — it does not dependably produce a smell, taste or visible change. Bulging lids, mold, cloudiness and off smells all mean discard, but their absence proves nothing. The protection is correct processing, not inspection.

Above 1,000 feet, yes, every time. Water boils cooler as you go up. Water bath canning adds time; pressure canning raises the pressure. See altitude adjustment.

Yes for acid and properly acidified foods, following USDA-funded research, with a hard limit: the total processing time including altitude adjustment must be under 45 minutes. See steam canners.

About a year for best quality. That is a quality window, not a safety cliff — a properly processed, well-sealed jar stored cool and dark stays safe beyond it, with declining color and texture.

Flat lids, no — the sealing compound is designed to compress once. Jars and screw bands are reusable indefinitely. Used flat lids are fine for freezer jam, fridge storage and dry goods. See can you reuse canning lids.

After 12 to 24 hours: the lid is concave and does not flex when pressed, it rings clearly when tapped, and it holds the jar's weight when lifted by the lid with the band off. See how to tell if a jar sealed.

It is not dangerous, just not shelf stable. Refrigerate and eat it within a few days, or reprocess within 24 hours with a new flat lid.

Yes, within a mouth size. Same company, same thread standard, no safety difference. See Ball vs Kerr.

No. Commercial food jars are not made for repeated heating and their rims are not manufactured to the standard a two-piece canning lid seals against.

Only when the processing time is under 10 minutes. At 10 minutes or longer the processing does it — the jars need only be clean and hot. See how to sterilize canning jars.

The NCHFP's rule for electric ranges is that the canner should be no more than 4 inches wider than the element. Measure your element, add 4 inches, and check against the canner's base diameter. Our calculator is at will it fit your stove.

Usually, if the canner is flat-bottomed, its base clears the 4-inch rule for your element, and your range manufacturer does not prohibit it. See pressure canning on a glass top stove.

Only if the manufacturer states that specific model meets USDA guidelines for pressure canning low-acid foods. Most do not, and a canning preset alone is not a validation. See electric pressure canners.

Weighted, unless you will genuinely get a dial gauge tested for accuracy every year. A weighted gauge never needs calibration.

The jar lifter. Kitchen tongs slip on a wet jar and a dropped hot quart is a genuine burn.

No, and we say so on every product. We read the manufacturers' published manuals, compile the specifications, and check every pick against the NCHFP's published canner rules. The full method is on how we pick.

Because we only display a price from a live, dated feed. Where there is no verified live price we send you to the current one rather than printing a number we cannot stand behind. A live price older than 48 hours disappears rather than going stale.

Yes. We participate in the Amazon Associates Program and earn a commission on qualifying purchases, at no extra cost to you. We accept no free products and no sponsored placements. See our affiliate disclosure.

Because we have none that are real. We do not test products, so any rating would be invented. We publish our reasoning and the published specifications instead.

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