Can Fresh Basil Be Preserved In Olive Oil

Fresh basil can be preserved in olive oil, and it’s one of the most flavorful ways to keep that summer garden taste alive all year long.
 
When you preserve fresh basil in olive oil, you’re essentially suspending those tender leaves in a protective, aromatic liquid that locks in both flavor and color.
 
I get asked all the time if fresh basil can be preserved in olive oil safely, and the answer is yes, but there are a few important rules you need to follow to avoid any risk.
 
In this post, we’ll break down exactly how to preserve fresh basil in olive oil, what mistakes to avoid, and how to get the most out of this delicious kitchen trick.
 
Let’s get into it.
 

Why Fresh Basil Can Be Preserved in Olive Oil

Fresh basil can be preserved in olive oil because the oil acts as a barrier that slows down the oxidation and moisture loss that cause basil to wilt and turn brown.
 
When you submerge basil leaves in olive oil, you’re creating an anaerobic environment that keeps the leaves from drying out while infusing the oil with that sweet, peppery basil essence.
 
The key is understanding that fresh basil can be preserved in olive oil when handled correctly, meaning the leaves are completely dry and free of any water droplets before they hit the oil.
 
Here’s why this method works so well.
 

1. Oil Blocks Air and Moisture

Fresh basil can be preserved in olive oil because the oil creates a seal around each leaf.
 
Air is the enemy of fresh basil, causing the leaves to oxidize and lose their vibrant green color.
 
Olive oil effectively cuts off that oxygen supply, so your basil stays looking fresh and tasting bright for months.
 
Moisture is another culprit, and since oil and water don’t mix, any tiny drop of water on your basil becomes a breeding ground for bacteria.
 
That’s why drying your basil thoroughly before preserving it in olive oil is non-negotiable.
 

2. Flavor Infusion Goes Both Ways

When you preserve fresh basil in olive oil, the oil slowly draws out the essential oils from the basil leaves.
 
This means your olive oil becomes basil-infused, perfect for drizzling over pasta, salads, or crusty bread.
 
At the same time, the basil leaves soak up the olive oil, which keeps them supple and prevents them from becoming brittle or dry.
 
It’s a win-win situation that transforms two simple ingredients into a gourmet staple.
 

3. It’s a Time-Saver for Busy Cooks

Fresh basil can be preserved in olive oil as a convenient way to have that fresh herb flavor ready to go at a moment’s notice.
 
Instead of chopping fresh basil every time you cook, you can just scoop out a spoonful of your preserved mixture and add it directly to your dish.
 
This saves prep time and reduces waste, especially if you’ve grown more basil than you can use in a week.
 

How to Preserve Fresh Basil in Olive Oil Safely

Now that you know fresh basil can be preserved in olive oil, let’s talk about the proper method to do it safely.
 
There are two main approaches: one for short-term fridge storage and one for longer-term freezer storage.
 

1. The Blender or Food Processor Method

This is the quickest way to preserve fresh basil in olive oil, and it works beautifully for freezing.
 
Start by washing your basil leaves and drying them completely with a salad spinner or paper towels.
 
Add the leaves to a food processor with enough olive oil to form a thick paste, about one cup of olive oil for every two cups of packed basil leaves.
 
Pulse until the mixture is smooth but still has a bit of texture.
 
Spoon the paste into ice cube trays and freeze.
 
Once frozen, pop the basil cubes out and store them in a freezer bag.
 
This way, fresh basil can be preserved in olive oil for up to six months without losing much flavor.
 

2. The Whole Leaf Method for Fridge Storage

If you prefer to keep whole leaves, fresh basil can be preserved in olive oil in a jar in the refrigerator.
 
Start with clean, bone-dry basil leaves.
 
Place a layer of leaves at the bottom of a clean glass jar, then pour olive oil over them until they’re fully submerged.
 
Add more layers until the jar is full, making sure the oil completely covers the top layer of leaves.
 
Seal the jar and refrigerate.
 
Your basil will stay fresh for about two weeks this way, but you must always keep it in the fridge and use clean utensils to scoop out leaves.
 

3. The Blanching Trick for Color Retention

Here’s a pro tip to make sure your preserved basil stays bright green.
 
Before you preserve fresh basil in olive oil, blanch the leaves in boiling water for just five seconds, then plunge them into ice water.
 
Dry them thoroughly before combining with olive oil.
 
Blanching deactivates the enzymes that cause browning, so your basil will look as vibrant in January as it did in July.
 

Common Mistakes to Avoid When Preserving Basil in Olive Oil

Even though fresh basil can be preserved in olive oil, there are pitfalls that can ruin your batch.
 
Let’s look at the biggest ones so you can steer clear.
 

1. Leaving Any Moisture on the Leaves

This is the number one cause of spoilage.
 
If you preserve fresh basil in olive oil with even a hint of water, you risk botulism, a dangerous foodborne illness.
 
Water droplets trapped under the oil create an oxygen-free zone where bacteria can thrive.
 
Always dry your basil leaves thoroughly and even let them air-dry for an hour before starting.
 

2. Storing at Room Temperature

Fresh basil can be preserved in olive oil safely, but only when kept cold.
 
Any product stored in oil at room temperature, especially with garlic or herbs, is at risk for bacterial growth.
 
Keep your basil, oil, and garlic mixture in the refrigerator at all times and never let it sit out for more than two hours.
 
If you’re planning to store it long-term, freeze it instead.
 

3. Using the Wrong Kind of Oil

Not all oils are created equal when you’re trying to preserve fresh basil in olive oil.
 
Extra virgin olive oil is the best choice because it has a lower moisture content and a higher level of antioxidants that help prevent rancidity.
 
Lighter olive oils or vegetable oils can go bad faster and won’t impart the same rich flavor.
 
Stick with good quality extra virgin olive oil for the best results.
 

So, Can Fresh Basil Be Preserved in Olive Oil?

Fresh basil can be preserved in olive oil, and it’s a fantastic way to keep that fresh garden flavor on hand.
 
The process works because the oil protects the basil from air and moisture while adding its own delicious character to the mix.
 
You just have to follow the safety rules we covered, most importantly, making sure your basil is bone dry and stored in the fridge or freezer.
 
Whether you blend it into a paste for freezing or keep whole leaves in a jar, you can preserve fresh basil in olive oil with confidence.
 
I hope this guide has shown you how easy and rewarding it is to preserve fresh basil in olive oil, so you can enjoy a taste of summer all year round.
 
Happy preserving, and enjoy every last drop of that basil-infused goodness.