How to Can Farm-Fresh Produce

Jul 3rd 2018

We make chocolate but we love all things food! The season for fruits and vegetables is upon us. Some old fashioned easy ways to preserve the TN bounty are presented by @tnhomeandfarm. Enjoy...and buy some mason jars!

How to Can Farm-Fresh Produce

By Jessica Mozo |


If you thought the practice of canning garden vegetables, meats and fruit-filled jams stopped with your grandmother’s generation, think again. While it’s true that the know-how behind the art of canning is largely tucked away in the minds of older generations, a number of young people have taken an interest in home canning in recent years. They want to know where their food comes from – and how it gets from field to can.

“Through the years, home canning became less popular as fresh foods became more available year round and more women found employment outside the home,” says Janie Burney, a professor in UT’s Department of Family and Consumer Sciences in Knoxville. “In recent years, with increased interest in food additives, antibiotics, pesticides, biotechnology and environmentally sustainable ways to produce food, there has been a resurgence of home canning. In 2016 in Tennessee, extension agents and volunteers made almost 3 million contacts with consumers [regarding canning] through news articles, educational exhibits, radio programs and other media.”


Photo by Michael Tedesco

History of Canning

Canning has been in practice in the United States since the mid-1800s, a breakthrough in food preservation that spread to America after Frenchman Nicolas Appert observed that food cooked inside a jar would not spoil – unless the seals leaked. He developed a process of sterilizing and sealing food in airtight glass jars, and by the turn of the century, canning was a common household practice in America.

“Home canning ensured the availability of food year round and reduced food waste,” Burney explains. “Canning clubs were among the earliest means of teaching canning and were first known as tomato clubs.”

In 1910, Virginia Moore became the first Tennessee Extension agent to work with women and girls to develop canning clubs and improve the lives of rural women through education.

“Girls were provided a small amount of land to grow tomatoes that were preserved using the latest techniques,” Burney says. “Boys had corn clubs, but tomatoes were seen as more suitable for girls since they were grown in home gardens, and canning could be done in the kitchen.”

Many young women sold their home-canned goods and used the money for college or family expenses. Their success led to the canning of many other foods besides tomatoes, including vegetables, fruits, jams and pickles. Canning quickly became a household necessity, especially for rural families.


Photo by Michael Tedesco

Canning at Home

Today, it can be a challenge to find a home canner who still practices the fairly lost art, but they do exist. Patti Dial of Franklin began canning green beans, tomatoes and pickles from her garden in 1977, and she continues to can today.

“In 1976, my husband and I visited his grandmother’s farm in Illinois, and I went in her cellar where she had shelves of canned green beans, pickles and grape juice. I was fascinated,” Dial recalls. “It was a real working farm. She served her pickles at every meal.”

Dial received the Farm’s Journal Freezing & Canning Cookbook as a wedding gift, and used it to teach herself how to can.

“I still use that book 40 years later,” she says with a chuckle. “Canning isn’t rocket science, so I knew I could figure it out. I’ve come a long way since then.”

Burney advises using newer canning literature as the science has evolved, and some USDA home-canning recommendations were revised as recently as 2009. See our sidebar for her resource suggestions.

Dial, now a certified Master Gardener, has canned lots of foods over the years, from pumpkin to hot pepper relishes to jellies. But in her family, she’s most famous for her home-canned green beans.

“I have three children who are all in their 30s, and they all love the green beans. My grandchildren call them ‘Grandma’s green beans,’ ” she says. “Whenever my friends and relatives come to my house, if I don’t serve my green beans, they’re very disappointed.”

Unlike store-bought canned goods, Dial’s veggies are canned within five or six hours of being picked from the garden, which she says makes them more nutritious. But she warns that canning isn’t for everyone.

“It’s a hobby that’s very time-consuming, and that’s the biggest reason it’s a dying art,” she says. “You have to till the garden, plant seeds, wait for them to come up, pull weeds, water them, pick them when they are ready and snap the ends. Then you boil the jars to sterilize them, put in the green beans, salt and water, put them in the pressure cooker, time it, then let it get cold again [allow the pressure to go all the way down] before you open it and take it out.”

Burney notes that you can also simply wash the jars with hot water and soap, and then add the green beans and salt, which is optional. “When canning green beans,” she says, “it is not necessary to boil them to sterilize since the pressure canning does the sterilization.”

Despite the time and effort that goes into it, Dial – like many others – finds the hobby rewarding.

“Cost-wise if you count the hours, those jars of green beans are probably worth 40 bucks apiece when you’re done,” she says.

But this isn’t a moneymaking endeavor.

“I give a lot of my cans away because people just love getting home-canned foods. It’s become a novelty item,” Dial says.


Photo by Michael Tedesco

Food Safety and Canning

While having your own garden helps, you don’t have to be a gardener to can. Many farms today offer CSAs (Community Supported Agriculture), allowing consumers to receive large quantities of freshly picked produce at a discounted rate.

But before you jump in, you need to know how to safely can foods. Foods that are not canned properly are a breeding ground for bacteria that cause serious and even fatal illnesses such as botulism.

“Botulism likes to grow in home-canned vegetables and meats because of their low acidity, so you have to process them at a high enough temperature to kill bacteria using a pressure canner,” Burney says.

“People used to boil their canned goods in a hot water bath, but pressure canners are recommended today. Water bath canners are still okay for highly acidic foods such as pickles, jams, jellies and fruits, because the acid helps prevent the growth of bacteria.”

It’s also important to make sure the jars are properly sealed. If you press on the lid, it shouldn’t give at all.

“The best advice is to follow a tested canning process – one that someone in a laboratory has done and tested to make sure it won’t support the growth of bacteria,” Burney says.

“If you want to can, give it a try,” Dial says. “It’s worth learning how to do for the appreciation of how difficult the early settlers, pioneers and even the Amish have it. Anybody can make applesauce or apple butter.”