Pressure Canning in Australia: Beans, Corn, Pumpkin and Meat

Updated October 2026

Low-acid food can only be bottled safely in a pressure canner. A Fowlers Vacola unit is not one, and for most Australian kitchens the freezer is the better answer.

Beans, corn, pumpkin, carrots, potatoes, mushrooms, meat, chicken and fish are low-acid foods. Sealed in a jar, they are where botulism toxin forms, and the only home method that has been tested to make them safe is a pressure canner run to a USDA process. Australia's Food Safety Information Council goes further and says vegetables are only safe to bottle at home in vinegar. If you have a glut of beans or corn and no pressure canner, blanch and freeze them, or pickle them from a tested recipe.

Why boiling water is not enough for vegetables and meat

Clostridium botulinum lives in soil and on produce as a spore. Boiling does not destroy the spore. In a sealed jar with little acid and no air it can grow and make a toxin you cannot see, smell or taste. Food Standards Australia New Zealand lists home bottled and canned food that was not processed properly as one of the higher risk foods for botulism, and says symptoms usually start 18 to 36 hours after eating.

Acid is what stops the spore. Food at pH 4.6 or below (fruit, properly acidified tomatoes, vinegar pickles) can be bottled in a water bath. Food above pH 4.6 needs the jar contents held at about 116°C, and a home kitchen only reaches that temperature under pressure.

What Australian food safety advice says

• Fruit: stick to high-acid fruit such as apples, pears and stone fruit (Food Safety Information Council).
• Tomatoes, mango, pawpaw, banana and other tropical fruit: add citric acid before bottling. Our passata and bottling guide gives the tested amounts.
• Vegetables: only safe to bottle at home in vinegar.
• Vegetables or herbs in oil: acidify them first, keep them in the fridge and use them within 10 days.
• Any jar that is badly damaged, bulging or looks spoiled: throw it out (FSANZ).

No Australian government body publishes its own processing times for home canning. The tested times that exist come from the United States Department of Agriculture, which is why every reliable pressure canning recipe you find here is American.

Our take: freeze the low-acid glut

A pressure canner here means an imported Presto or All American from a specialist online seller, plus Mason jars, and a dial gauge with no local testing service that we could find. Blanched beans, corn kernels and pumpkin cubes keep for months in a freezer with none of the botulism risk. Unless you are bottling meat or stocks in quantity, freezing is the better use of your money.

If you own a pressure canner: the tested rules

These come from the USDA Complete Guide to Home Canning (2015). Follow them exactly; none of them is a starting point for adjustment.

1. Use a real pressure canner. USDA's processes assume a canner that holds at least four US quart jars. Electric multicookers with a pressure or canning setting have not been tested and the National Center for Home Food Preservation says not to can in them.
2. Use Mason-type jars with two-piece self-sealing lids. Ball Mason jars and lids are sold here. USDA tested its processes in these jars. Fowlers jars with rubber rings and clips, and Weck-style jars, were not part of that testing.
3. Put 5 to 8 cm of hot water in the canner (USDA says 2 to 3 inches) unless the recipe asks for more.
4. Vent for 10 minutes. With the lid locked and the vent open, heat until steam pours out in a steady funnel, then time 10 minutes before you fit the weight or close the petcock. Trapped air lowers the temperature inside.
5. Start timing only when the gauge reaches the target pressure, or when a weighted gauge starts to jiggle or rock the way its maker describes.
6. If the pressure falls below the target, bring it back up and start the whole time again.
7. Let the canner cool by itself. No cold water, no lifting the weight early. When it reads zero, take the weight off, wait 10 minutes, then open the lid away from your face.
8. Leave the jars 12 to 24 hours before checking seals and taking off the bands.
9. Check a dial gauge every year. USDA says replace it if it reads more than 2 pounds (about 14 kPa) high or low. We could not find a public gauge testing service in Australia, so a weighted-gauge canner is the simpler choice here.

Pressure for Australian altitudes

Water boils at a lower temperature as you go higher, so you add pressure, never time. Canners sold here are American and their weights and dials read in pounds per square inch (psi). USDA sets the bands in feet; we give the metre figure rounded down so you land in the safer band. Canberra, Toowoomba, Ballarat, Orange, Armidale, the Blue Mountains and the New England and Southern Tablelands all sit above 300 m.

These pressures are the ones USDA gives for most vegetables, including green beans. A few foods use different pressures, so always read the table for the food you are canning.

What the processing times look like

Two USDA examples, for the pressures above:

• Green beans (hot or raw pack, 2.5 cm headspace): pints 20 minutes, quarts 25 minutes. There is no safe boiling water option.
• Pumpkin and butternut in 2.5 cm cubes: pints 55 minutes, quarts 90 minutes. Never mash or puree pumpkin for canning, and do not bottle pumpkin soup. There is no tested process for either.

USDA times are for US pint (473 ml) and quart (946 ml) jars. Half pints share the pint time, and jars above a pint up to a quart share the quart time, so a 500 ml jar takes the quart time. There is no tested time for a 1 litre jar of vegetables.

Storing jars and when to throw one out

USDA advises storing jars between 10 and 21°C and never above 35°C. A tin shed or garage in an Australian summer passes that easily, so keep jars indoors in a dark cupboard and use them within a year.

Do not taste food from a jar if the lid has lifted or bulges, the seal has gone, liquid spurts when you open it, it smells wrong or has mould on top. A sealed suspect jar goes into a heavy rubbish bag and into the bin, out of reach of children and pets. If one has leaked or been opened, wear gloves and follow the USDA clean-up steps (boiling the jar 30 minutes, then bleach on every surface it touched).

If anyone becomes unwell after eating home-bottled food, with blurred or double vision, a dry mouth, or trouble speaking, swallowing or breathing, call 000.

See also: The four ways to preserve, Passata and bottling for the water bath method, and Pickling for the vinegar route.

Sources we checked (October 2026): Food Standards Australia New Zealand, Clostridium botulinum (updated November 2025); Food Safety Information Council, Home bottling and canning; USDA Complete Guide to Home Canning (2015) through the National Center for Home Food Preservation: Using Pressure Canners, Snap Beans, Pumpkins and Winter Squash, Storing Home Canned Foods, Identifying and Handling Spoiled Canned Food; NCHFP, Can I Can in a Multi-Cooker?.

Common questions