How to Preserve a Garden Harvest

Jars of preserved garden harvest, canning and fermenting

Canning, 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 gardener 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 pile. A good preserving habit means you eat your own garden long after the season ends, and you stop buying the same things at the store.

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 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, chilies and other veggies. No heat, no special gear, and it adds gut-friendly bacteria and flavor.

Freezing and dehydrating

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

Which method suits which food? High-acid fruit goes to jam, canning 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. Chilies and herbs dry beautifully. Tomatoes sit right on the line and can be water-bath canned 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 for the exact processing time and method, and do not improvise or shorten times. In the US, use recipes from the USDA Complete Guide to Home Canning and the National Center for Home Food Preservation, or your state Cooperative Extension service. These are the trusted, lab-tested sources for safe processing times.

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). Always pair it with a tested recipe for exact times.

I have a glut of

Method how-tos

Water-bath canning 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 1 inch. Bring to a rolling boil and process for the exact time in your tested recipe, adjusting for your altitude. Lift the jars out, leave them undisturbed for 12 to 24 hours, then check each lid has sealed by pressing the center. 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 roughly 1 tablespoon of salt per quart of water. For dry-salted ferments like sauerkraut, use about 20 grams of salt per kilogram of shredded cabbage (a little under a tablespoon per pound) and massage it until it releases its own brine. Pack the veggies 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-iodized salt, taste as you go, and move it to the fridge when you like the sourness.

Drying and dehydrating

Drying removes the water that mold 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, chilies, 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 color, texture and flavor 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 right away by an ice bath to stop the cooking. This halts the enzymes that otherwise turn frozen veggies 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

Across most of the US the preserving year follows the harvest season, which shifts earlier in the South and later in the North. Florida and the frost-free South run on a cool-season harvest instead, so the big put-up months come in winter and spring rather than late summer.

Summer (June to August): the big preserving season in most zones. Tomatoes for sauce and salsa, zucchini, cucumbers for pickles and ferments, beans, corn, chilies, peppers, berries and stone fruit such as peaches and plums.
Fall (September to November): apples and pears for sauce and drying, late tomatoes and peppers, winter squash and pumpkins for storage, and cabbage for sauerkraut.
Winter (December to February): citrus glut in the warm South, so lemons for preserving and marmalade, plus stored root crops and the start of the Florida cool-season harvest.
Spring (March to May): the Deep South and Florida hit their main harvest, with tomatoes, beans and greens, while colder zones use up stored crops and get ahead on jars, salt and gear before summer.

For timing tuned to your zone, pick your region on the what to plant now page 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 pile.

Open the App →

Common 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, such as those from the USDA and the National Center for Home Food Preservation, 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, beets, 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 roughly 1 tablespoon of salt per quart of water, or about 20 grams of salt per kilogram of vegetables for a dry-salted ferment like sauerkraut. Use non-iodized 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 canned high-acid 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 canning 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, 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 canning 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 canning and drying. Cucumbers and cabbage suit fermenting and pickling. Most vegetables suit freezing after blanching, or pressure canning. Chilies and herbs suit drying. Tomatoes can be water-bath canned 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.

Source: USDA Complete Guide to Home Canning and the National Center for Home Food Preservation; university Cooperative Extension food preservation guidance.