Wednesday, June 3, 2020


Moab, UT

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    Preserving the harvest: Review the basics before filling the canning jars

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    Canners are encouraged to make safety the top priority this harvest. Photo courtesy of USU Extension

    To those who plan to preserve the harvest this year, it’s good to review the basics so the final products have maximum quality, shelf life and safety. The advantages of home canning are lost when jars fail to seal properly, when food spoils or when flavor, texture, color and nutrients deteriorate during storage. (USDA Complete Guide to Home Canning). Consider these tips to achieve the best results.

    Quality in equals quality out

    Examine foods carefully for freshness and wholesomeness. Discard diseased and moldy food; however, small bruises or lesions in food can be trimmed away.

    It is unrealistic to assume under- or over-ripe fruits or droopy vegetables will perk up as a result of preserving. The same holds true for bruising or discoloration. Also, just because a food is grown and can be eaten fresh doesn’t guarantee it will hold up well as a canned or frozen product. Keep in mind that some foods work especially well when dehydrated or freeze-dried.

    Be mindful of shelf life

    As a general rule, unopened home-canned foods have a shelf life of one year and should be used before two years – which probably leaves canners wondering if they should throw away home-canned foods that are three years old or more. The answer is not necessarily.

    If proper guidelines for processing (including high-altitude changes) and storage have been followed and the jar still has a strong seal, safety will not be the issue, rather it will be quality. After one year, textures and flavors start to break down, as do color and nutritional value. The food may not look or taste its best, but it will still be safe to eat. More information can be found in the USU Extension fact sheet at

    With frozen foods, the enemies of longevity include: freezer temperature not being cold enough; not using freezer containers, heavy plastic bags or wrap to prevent freezer burn; or the formation of ice crystals, which is moisture extracted from the food. Even with optimal conditions, frozen foods are best when consumed within six to twelve months.

    Dehydrated foods are affected by temperature and moisture along with exposure to air. Any of these conditions will shorten shelf life and may allow mold to grow on the surface of foods. It’s best to include an oxygen absorber packet inside each container to extend the shelf life beyond a few months.

    Make food safety the top priority

    Most bacteria, yeasts and molds are difficult to remove from food surfaces. Washing fresh food reduces their numbers only slightly. Peeling root crops, underground stem crops and tomatoes reduces their numbers greatly, and blanching also helps. But the two vital safety controls are the method of canning and making sure the recommended processing times found in research-based food preservation manuals or online sources are used. Contact the local USU Extension office for guidance on whether a recipe is research-based.

    Canners may be using an approved resource for a recipe, but they should make certain it contains information for processing at high altitudes. Generally speaking, pressure canning low-acid foods such as meats, vegetables and some tomato-based products requires an increase of pressure by 13-15 pounds using dial- or weighted gauges as insurance against botulism food poisoning. Water-bath canning requires increased processing times; generally, an additional 10 minutes. Tomatoes are in a category all by themselves and without exception, must be prepared as recommended, including increasing the acid level by adding bottled lemon juice.

    Take the time to learn and incorporate key safety tips when preserving foods at home. It will add protection and guarantee the highest, longest-lasting food quality.

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