How to Preserve a Garden Glut in Australia

Glass jars of home-preserved tomatoes, pickles and jam on a kitchen bench

Bottling, fermenting, drying and freezing the safe way, with a picker that tells you the best way to keep any crop

There is a moment every grower hits. The tomatoes ripen all at once, the zucchini will not stop, and you cannot give it away fast enough. Preserving is how you turn that glut into a full pantry instead of a full compost bin. A good preserving habit means you eat your own garden long after the season ends, and you stop buying the same things at the shops.

This guide explains the four main ways to preserve food in plain language, shows you which method suits which crop, and gives you an interactive picker so you can choose the best way to keep a glut of any vegetable or fruit. It also covers the one thing that matters most, which is food safety, so you preserve in a way that is genuinely safe to eat.

The Four Main Ways to Preserve

Almost every preserving method comes down to one of four approaches. Each one keeps food by removing what spoilage organisms need, whether that is heat, acid, salt, cold or water.

Water-bath bottling and canning

Jars of high-acid food are heated in boiling water to seal them and destroy spoilage organisms. Best for jam, fruit, pickles, relish and tomatoes with added acid. Simple and cheap, but only safe for high-acid foods.

Pressure canning

A sealed pressure canner reaches a higher temperature than boiling water, hot enough to make low-acid foods shelf stable. This is the only safe way to can plain vegetables, beans, meat and stocks for the cupboard.

Fermenting

Salt and time let good bacteria sour the food and protect it. Best for cabbage (sauerkraut and kimchi), cucumbers, chillies and other veg. No heat, no special gear, and it adds gut-friendly bacteria and flavour.

Freezing and dehydrating

Freezing parks food in suspended animation, most veg keeping best after a quick blanch. Drying removes the water that spoilage needs, ideal for herbs, chillies, tomatoes, apples and figs. Both are forgiving and beginner friendly.

Which method suits which food? High-acid fruit goes to jam, bottling and drying. Cucumbers and cabbage shine when fermented or pickled. Most plain vegetables freeze well after blanching or need a pressure canner for the shelf. Chillies and herbs dry beautifully. Tomatoes sit right on the line and can be water-bath bottled only when you add acid. The picker further down sorts this out crop by crop.

Safety first, this is the part that matters

The single most important rule in preserving is matching the method to the acidity of the food.

High-acid foods such as fruit, jam, most pickles, and tomatoes with added acid are safe to process in a boiling water bath. Their natural acidity stops the bacteria that cause botulism.

Low-acid foods such as most plain vegetables, beans, corn, pumpkin, and any meat or fish must be processed in a pressure canner. Boiling water alone does not get hot enough to destroy botulism spores in these foods.

Never water-bath low-acid foods. Putting plain vegetables or meat in jars and boiling them is a real botulism risk. If you do not have a pressure canner, freeze, dry or ferment those foods instead, or pickle them in a tested high-acid recipe.

Always follow a tested recipe from a trusted source for the exact processing time and method, and do not improvise or shorten times. In Australia, follow reputable, current home-preserving guidance and tested recipes, including the instructions that come with your bottling or canning equipment, rather than guessing.

What to Preserve From This Glut

Pick the crop you have too much of and this tool shows you the best ways to keep it, a quick one-line how for each, and whether it is high-acid (safe to water-bath) or low-acid (better fermented, frozen, dried or pressure canned). Choose a tested recipe for exact times.

I have a glut of

Method How-Tos

Water-bath bottling basics

This is the entry point for jam, fruit, pickles and acidified tomatoes. Wash jars and keep them hot. Fill hot jars with the prepared high-acid food, leaving the headspace your recipe specifies. Wipe the rims, fit new sealing lids and screw bands fingertip tight, then lower the jars into a large pot of water so they are covered by at least 2 to 3 cm. Bring to a rolling boil and process for the exact time in your tested recipe, adjusting for altitude if needed. Lift the jars out, leave them undisturbed for 12 to 24 hours, then check each lid has sealed by pressing the centre. Any jar that did not seal goes in the fridge to eat soon.

A simple salt-brine ferment

Fermenting is the most forgiving preserve once you learn the salt rule. For most vegetables, use a 2 percent salt brine, which is about 20 grams of salt per litre of water. For dry-salted ferments like sauerkraut, use about 20 grams of salt per kilogram of shredded cabbage and massage it until it releases its own brine. Pack the veg into a clean jar, keep everything fully submerged under the brine with a weight, and leave it at cool room temperature. It will bubble and turn pleasantly sour over one to four weeks. Use non-iodised salt, taste as you go, and move it to the fridge when you like the sourness.

Drying and dehydrating

Drying removes the water that mould and bacteria need. A dehydrator is easiest, but a very low oven or good airflow works for many foods. Slice evenly so everything dries at the same rate, and dry until the food is leathery or brittle with no soft moist spots. Herbs, chillies, apple rings, figs and tomatoes all dry well. Store dried food in an airtight jar in a dark cupboard, and check for any sign of moisture in the first week, which means it needs more drying.

Freezing prep and blanching

Freezing is the easiest preserve of all, and most vegetables keep their colour, texture and flavour far better if you blanch them first. Blanching means a short plunge in boiling water (usually 2 to 4 minutes depending on the vegetable) followed straight away by an ice bath to stop the cooking. This halts the enzymes that otherwise turn frozen veg dull and tough. Drain well, pack into bags or containers with the air pushed out, label with the date, and freeze. Soft fruit and herbs can usually be frozen without blanching.

What Is in Glut Now, by Season

Australia runs on southern-hemisphere seasons, so the preserving year looks like this for most regions. Your exact timing shifts with your climate zone, and tropical and subtropical gardens run to a wet-and-dry rhythm instead.

Summer (December to February): the big preserving season. Tomatoes for passata and sauce, zucchini, cucumbers for pickles and ferments, beans, chillies, berries, stone fruit such as plums and peaches, and figs.
Autumn (March to May): apples and pears for sauce and drying, late tomatoes, capsicum and chillies, pumpkins for the shelf, and the first of the citrus in warmer areas.
Winter (June to August): citrus glut, so lemons for preserving and marmalade, plus stored root crops, cabbage for sauerkraut, and beetroot for pickling.
Spring (September to November): lighter for gluts, but a good time to use up the last of the stored harvest and get ahead on jars, salt and equipment before summer hits.

For timing tuned to your exact spot, use Find My Region or open the Planting Season app.

Your harvest planner tells you what is coming, preserving banks it

The Planting Season app shows you what is heading for surplus before it lands, so you can line up jars, salt and freezer space in time. Log your harvest, watch the totals, and turn a glut into a full pantry instead of a full compost bin.

Open the App →

Frequently Asked Questions

Is home canning safe?

Yes, when you match the method to the food. High-acid foods such as fruit, jam, pickles and tomatoes with added acid can be safely processed in a boiling water bath. Low-acid foods such as most vegetables, beans and meat must be processed in a pressure canner, because boiling water alone does not reach a high enough temperature to destroy the spores that cause botulism. Always follow a tested recipe from a trusted source and never improvise processing times.

What foods need a pressure canner?

Low-acid foods need a pressure canner. That means most plain vegetables such as beans, corn, carrots, beetroot, pumpkin and potatoes, as well as meat, poultry, fish and stocks. These foods do not have enough natural acid to stop botulism, so they must reach temperatures only a pressure canner can deliver. If you do not own a pressure canner, freeze, dry or ferment these foods instead, or pickle them in a tested high-acid recipe.

What is the salt ratio for fermenting vegetables?

For a salt brine ferment, a 2 percent salt solution suits most vegetables. That is about 20 grams of salt per litre of water, or 20 grams of salt per kilogram of vegetables for a dry-salted ferment like sauerkraut. Use non-iodised salt, keep the vegetables fully submerged under the brine, and ferment at cool room temperature. Some firmer or warmer-climate ferments use up to 3 to 5 percent for extra safety.

How long does preserved food keep?

It depends on the method. Correctly bottled high-acid foods and pressure-canned foods keep about 12 months in a cool, dark cupboard for best quality. Dried foods keep 6 to 12 months in an airtight jar. Frozen produce keeps 8 to 12 months. Ferments keep for months in the fridge once they reach the sourness you like. Label everything with the date and use the oldest first.

Can I reuse jar lids?

The flat sealing lids used for water-bath and pressure canning are single use, because the sealing compound only forms a reliable seal once. Reusing them risks a failed seal and spoiled food. The screw bands and the jars themselves can be reused many times if they are not chipped or cracked. Lids for fridge pickles and ferments that are not heat processed can be reused.

What is the easiest preserve for a beginner?

Freezing is the easiest and safest place to start, as there is no processing to get wrong. After that, a refrigerator pickle or a small batch of jam or a simple salt-brine ferment such as sauerkraut are all forgiving and need no special equipment. Move on to water-bath bottling of high-acid foods once you are comfortable, and add a pressure canner only when you want to put up low-acid vegetables for the shelf.

Which preserving method suits which food?

High-acid fruit suits jam, water-bath bottling and drying. Cucumbers and cabbage suit fermenting and pickling. Most vegetables suit freezing after blanching, or pressure canning. Chillies and herbs suit drying. Tomatoes can be water-bath bottled only with added acid such as lemon juice or citric acid. Use the interactive picker on this page to see the best options for any crop.