A few years ago I made about 24 half-pint jars of blueberry jam with locally-grown blueberries. It was a fairly simply process, and it was just delicious; it tasted a lot more like blueberries and less like sugar than commercial jam does. It didn’t last as long as I had hoped, though, as we gave a lot of it away as gifts and tended to heap it on toast and bagels ourselves.
Jams, jellies, preserves, pickles and tomatoes are quite easy to can because they have a high acid content and can be processed with a minimum of equipment, trouble, or worry. But, except for the tomatoes, the end products aren't particularly nutritious. I’ve always wanted to learn to can other foods we grow in abundance here during certain seasons: greens, corn, field peas, butter beans, green beans, sweet potatoes, etc.
In order to can these low-acid vegetables, the USDA says (very adamantly) that one must use an expensive pressure canner. This is the first hurdle. When I went to a canning workshop at the county extension office earlier this week, I learned of another: accurately calibrated pressure gauges are vital, and pressure gauges can lose their accuracy over time. Apparently, the manufacturer’s instruction booklets advise bringing them in yearly to the local county extension office to be checked. But due to cost and liability our extension office does not provide that service. And neither does anyone else according to the extension agent.
In addition, the instructor said that canned goods should be stored in a cool, dry place at a temperature between 60 and 70 degrees. Obviously, this too is a problem here… There is no place in or near my home that remains at that temperature range for more than a few weeks in the dead of winter.
So, what to do? Our instructor suggested that we should use the cans within one year, rather than the two-five recommended by the USDA, which seems do-able. And there is an alternative type of pressure canner that uses weights instead of a dial gauge as a measure of pressure that I would like to look into.
Although this part of the country does not have the ideal weather for storing preserved foods, it does offer the possibility of nearly year-round fruit and vegetable production. So preservation is not nearly as crucial as it would be if we lived further north.
So, as appealing as the vision of rows of canned vegetables lining my pantry shelves is (I admit in a kind of Walton-esque way), it doesn't seem to make that much sense for this locale. I do plan on canning tomatoes this year – for year-round soup base and sauce. And I may, if I can get my hands on an affordable weight gauge pressure canner, try canning early-summer field peas and butter beans, since they would be a good source of year-round protein. We'll store them in our dark-ish pantry for less than a year. Other than that, we'll count ourselves lucky to live in a place where there is fresh stuff available so much of the time.