Canning and Preserving Your Harvest

July 20, 2017
Canning and Preserving Your Harvest


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If you are blessed with an overabundance of fresh fruit and vegetables, preserve your harvest for winter. Canning is one time-honored way. Here’s an overview on how to can!

NOTE: Guidelines for safe canning are always being updated so use current information. Your local county extension office has a wealth of information about canning.

  • Gather all your ingredients and equipment and make sure you have everything you need before you start. Halfway through the process is no time to be running to the store.
  • Follow recipes and directions exactly. No improvising; your family’s safety depends on doing this correctly.

The Acid Test

Is the food you are canning high or low in acid? A pH of 4.6 is the dividing line; a higher pH number means less acidity and a lower pH number means more acidity.


Low acid vegetables such as green beans or corn need to be processed at a high temperature to prevent growth of deadly botulism which thrives in an airless, low acid, moist environment. This toxin is odorless and colorless and so potent that even a minute amount can cause paralysis and death. To kill it off, low acid foods must be processed at 240 degrees—hotter than boiling water. To maintain high enough temperatures for the proper length of time you need to invest in a pressure canner. This process is not for the novice.

No Pressure

Most low acid foods can be preserved in other ways and they will not only be safer but taste better. Broccoli, corn, and green beans taste much better when frozen and have better texture. Blanch them briefly in boiling water, cool down quickly in ice water, and pack them in bags or containers for the freezer.

Put ‘Em Up!

Harmful bacteria won’t survive in high acid conditions so pickles, relishes, salsas, and tomatoes are very safe for the beginning canner. (To be on the safe side, you can add extra acidity with lemon juice or vinegar.) Jams, jellies, fruits, and tomato and fruit juices are also highly acidic. They all can be safely processed in a boiling water bath. A water bath canner is just a large deep pot with a special rack to hold 6 to 8 jars.


To avoid canning burnout, start with a small project at first. Try a few jars of salsa instead of a bushel of tomatoes. Prepare the recipe and get the water in the canner boiling.

Put A Lid On It!

Sterilize the jars and keep them hot until you are ready to fill them. Use real canning jars and new 2- piece lids. Keep the flat part of the lid hot; the screw ring needs to be clean but not hot. Fill the jars to within 1/4 inch of the top, this is called head space and can vary depending on your recipe. Wipe the jar rim and threads clean and put on the lid. Tighten it only finger tight. Place jars on the rack in the boiling water so that they are covered by at least 1 inch of water. Count processing time once the water has returned to a boil.


Most pickles need only 5 minutes in boiling water. Lift out the whole rack to remove the jars and spread them out to cool. If you hear popping noises it is the jars sealing. Once the jars are cool check the seal; the center of the lid should be depressed. If a jar doesn’t seal put it in the fridge to eat right away. The sealed jars can be labeled and stored in the pantry for winter.

The sight of those gleaming jars full of delicious food is very satisfying!

If you found this overview interesting, we’d advise that you read the USDA Complete Guide to Home Canning to make sure you read the latest on safe and effective canning!



About This Blog

Get inspired by Robin Sweetser’s backyard gardening tips and tricks. Robin has been a contributor to The Old Farmer’s Almanac and the All-Seasons Garden Guide for many years. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer’s Market.

Reader Comments

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What to do with so many large zuccini!

When I check for small ones there too small next check there giant. What can I dobesides feed to chickens.

what to do with so many large zucchini

Have you tried zucchini parmesan? Make same as eggplant parm, but use those giant zucchini!

Cauliflower and freezing

We freeze alot of our garden grown there a trick to freezing cauliflower where it won't be mushy when you go to use them? Also would canning cauliflower be canned the same as pickles and other vegies?

how to freeze cauliflower

Hi, Angela. You’ll want to wash, then blanch your cauliflower before freezing. Cut the cauliflower into florets and then let it soak in salted water as you boil a pot of water. Also prepare a bowl with ice water. When the water in the pot is boiling, drop florets in and boil for no more than 5 minutes. Drain the cauliflower and then put in the ice water for 2 to 3 minutes. Drain again and dry. Lay the cauliflower in a single layer on a cookie sheet (or sheets) and put in the freezer. After 2 hours, transfer to resealable plastic bags or containers with lids. Eat the cauliflower within a year for best quality.

We have a Mustard Pickles recipe that uses cauliflower. You can find it in our pickling guide here:

Green beans

I am new at this. I misread the canning instructions for green beans and put 6 pints in a water bath. After they were in the canner I saw where it said pressure canner. I did leave them in for about 45 minutes. Are they already bad? It has been about a week. Thanks

canning green beans

Hi, Lynelle. When canning green beans, pressure canning is required. You could put your batch in the refrigerator and eat them soon, but they are not safe for storage.

Green beans

Thanks for your reply. Could I freeze them?

We would not recommend

We would not recommend freezing them.

Fear the can

Hi Robin, I so much want to can, but I'm scared to death of looking at my canning and to see only mold. What if I get it nervous about canning the first time. I'm also not sure where you get new lids. They only come together in pairs (Lids with jar). Canning is a must, as waste of food cannot bring any kind of blessing. Thanks and regards,

Start small with something

Start small with something foolproof like pickles or jam and work your way up. Once you have some successes under your belt canning won’t seem so daunting.

Separate canning items


As I was looking around your message, I discovered the date. Wow!

Regardless, besides so many places to order on-line, you can pick up individual items at any full-service, Menard's store.


Rings & lids to to put on Canning Jars

I have many jars to use, but no new lids and rings to seal them with. Where can I buy them? Can I buy them through you?

Hi Ann, Any store that sells

Hi Ann, Any store that sells jars should also carry lids and rings. Our local grocery store, hardware store, and garden center all have canning supplies.

canning applesauce

I been making and canning applesauce. I just read you can not do this on a glass stove? Is this really so? Said pan is too heavy and will break glass. I was using a regular stock pot that was heavier than the canner.

There are several problems

There are several problems with glass or ceramic cooktops. Many canners have concave bottoms that tend to form suction on flat glass tops. When you try to lift them the suction can be strong enough to crack the cooktop. Even if you use a flat bottomed pot, it can be too heavy when full, cracking the cooktop or scratching it if you drag the pot across it. A lot of glass cooktops have sensors that turn off when the temperature gets too hot or they cycle the heat on and off so your pot won’t boil steadily and maintain the temperature needed to safely process the food. Pots with a diameter greater than the burner by more than 1 inch can reflect heat onto part of the glass top not meant to get that hot causing it to discolor or crack. Check with the manufacturer of your cooktop before canning on it. You may have to invest in a simple electric or propane burner for canning purposes.


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