Can Basil Pesto Be Canned

Basil pesto can be canned, but it requires a specific method to ensure safety and quality.
 
If you’ve been wondering if basil pesto can be canned safely at home, the short answer is yes, but there are important rules you need to follow.
 
Most homemade pesto recipes contain low-acid ingredients like basil, garlic, and olive oil, which create a risk for botulism if you try to water-bath can them.
 
However, you can absolutely can basil pesto using a pressure canner, and you can also use a clever trick with the water-bath method if you make a few adjustments.
 
Let’s dig deep into everything you need to know about whether basil pesto can be canned, the best techniques, and how to keep your pesto delicious and safe.
 
In this post, we’ll cover why basil pesto can be canned with the right equipment, the pitfalls of traditional recipes, and step-by-step guidance for both methods.
 
Let’s get started.
 

Why Basil Pesto Can Be Canned With A Pressure Canner

The reason basil pesto can be canned successfully is because a pressure canner reaches temperatures high enough to destroy harmful bacteria.
 
Unlike a boiling water bath, which only hits 212°F, a pressure canner gets up to 240°F or higher, depending on your altitude and settings.
 
This high heat is crucial because pesto’s ingredients—like fresh basil, garlic, and cheese—are low in acid.
 
Low-acid foods are perfect breeding grounds for Clostridium botulinum, the bacteria that causes botulism, if they aren’t processed at the right temperature.
 
So yes, basil pesto can be canned safely, but only if you’re using a pressure canner and following tested guidelines.
 
Let’s break down the reasons this method works so well.
 

1. High Heat Kills Botulism Spores

The main reason basil pesto can be canned with a pressure canner is that the intense heat destroys the spores that cause botulism.
 
These spores are incredibly resilient and can survive boiling temperatures.
 
But a pressure canner’s higher heat neutralizes them completely.
 
That’s why any reputable canning source will tell you that low-acid foods like pesto must go through a pressure canner, not a water bath.
 
If you follow the exact processing times and pressure levels for your altitude, your canned basil pesto will be shelf-stable for up to a year.
 

2. Oil and Garlic Need Special Handling

Another reason basil pesto can be canned safely with a pressure canner is that the process handles the oil and garlic properly.
 
Garlic is a low-acid vegetable that can harbor botulism spores, and oil creates an anaerobic environment that helps those spores thrive.
 
When you pressure can pesto, you’re essentially forcing the heat into every jar, including the center of the oil mixture.
 
This ensures that the entire jar reaches the safe temperature, not just the outer edges.
 
That’s a key point: basil pesto can be canned, but you can’t cut corners with the processing time.
 

3. The Cheese Is a Non-Issue If Handled Right

Many people worry that the Parmesan cheese in pesto will cause problems, but basil pesto can be canned with cheese as long as you use a pressure canner.
 
The cheese won’t affect the safety of the canning process because the heat is high enough to kill any bacteria.
 
However, you should expect the cheese to change texture slightly after canning.
 
It will become softer and may separate a bit, but the flavor will still be rich and delicious.
 
If you want to avoid texture changes, you can also stir in fresh cheese after opening the jar before serving.
 

Why Basil Pesto Can’t Be Water-Bath Canned (And What To Do Instead)

So, can basil pesto be canned using the simpler water-bath method?
 
The straightforward answer is no, not if you’re using a traditional pesto recipe.
 
Water-bath canning relies on high acidity to prevent bacterial growth, and pesto just doesn’t have enough acid.
 
However, there’s a safe workaround: you can make an acidified pesto.
 
This means adding lemon juice or vinegar to lower the pH and allow for water-bath canning.
 
Let’s walk through the reasons and the solution.
 

1. The Low-Acid Problem

The reason basil pesto can be canned in a water bath only if you add acid is because the ingredients are naturally low in acid.
 
Basil has a pH around 5.5 to 6.5, and garlic and cheese are even higher on the pH scale.
 
For water-bath canning, you need a pH below 4.6 to stop botulism in its tracks.
 
So unless you add a significant amount of lemon juice or vinegar, you’re risking serious food safety issues.
 
Don’t play around with this—botulism is no joke.
 

2. The Acidified Pesto Trick

If you’re set on using a water bath, you can still can basil pesto by making it more acidic.
 
One tested method is to add two tablespoons of bottled lemon juice per pint jar before filling it with pesto.
 
You’ll also want to reduce the garlic and skip any extra oil on top.
 
This changes the flavor a bit, but it allows basil pesto to be canned safely at home without a pressure canner.
 
Just remember: this is only safe if you follow a tested recipe from a trusted source, like the USDA or a university extension.
 

3. The Freezer Alternative

If you don’t have a pressure canner and you don’t want to alter your prized pesto recipe, freezing is your best friend.
 
While basil pesto can be canned, freezing is actually the simplest way to preserve it at home.
 
Just spoon fresh pesto into ice cube trays, freeze until solid, then pop the cubes into a freezer bag.
 
This method preserves the bright green color and fresh flavor better than any canning method.
 
So if you’re not ready to invest in a pressure canner, go the freezer route.
 

Step-By-Step: How To Can Basil Pesto With A Pressure Canner

If you’ve decided that basil pesto can be canned in your pressure canner, here’s exactly how to do it.
 
This process is straightforward, but you must follow the steps precisely to stay safe.
 

1. Prepare Your Pesto Recipe

Make your favorite pesto, but leave out the cheese if you want a firmer texture after canning.
 
You can add fresh cheese when you serve it later.
 
Also, use less garlic than you normally would, since garlic’s flavor intensifies during pressure canning.
 
A good rule of thumb is to use half the garlic and half the oil called for in your recipe.
 
This prevents the pesto from becoming too oily or too sharp after processing.
 

2. Fill Your Jars

Ladle the pesto into clean, hot jars, leaving about 1 inch of headspace at the top.
 
Use a spatula to remove any air bubbles by gently pressing the pesto down.
 
Wipe the rims of the jars with a damp cloth to ensure a good seal.
 
Place the lids on and screw the bands until fingertip-tight.
 
Do not over-tighten, or air won’t escape during processing.
 

3. Process In The Pressure Canner

Place the jars in your pressure canner with the recommended amount of water.
 
Process pints for 75 minutes at 10 pounds of pressure (adjust for altitude if needed).
 
For quarts, process for 90 minutes.
 
Once the time is up, turn off the heat and let the canner cool naturally.
 
Never force-cook the canner with cold water.
 
After the pressure drops to zero, remove the jars and let them cool on a towel.
 

4. Check The Seals

After 12 to 24 hours, check that each lid is concave and doesn’t pop when pressed.
 
If any jar didn’t seal, just store it in the fridge and use it within a week.
 
Properly sealed jars can be stored in a cool, dark pantry for up to a year.
 
Your canned basil pesto will be ready to toss with pasta, spread on sandwiches, or mix into soups.
 

So, Can Basil Pesto Be Canned?

Basil pesto can be canned safely, but you must use a pressure canner.
 
Water-bath canning only works if you acidify the pesto with lemon juice, and even then it’s not quite the same.
 
Freezing remains the easiest and most flavor-preserving option for most home cooks.
 
But if you want that shelf-stable convenience, pressure canning is your best bet.
 
Just remember to always follow tested recipes and adjust for your altitude.
 
So go ahead and can basil pesto this season, and you’ll have jars of green goodness ready all year long.