If you are trying to cut down your grocery bills, save cash to fund a new side hustle, or even find ways to make a bit of extra money from your garden, learning how to preserve fresh herbs is a very practical skill. We have all been there: you buy a packet of fresh mint from the supermarket for a recipe, use a few sprigs, and leave the rest in the fridge. Three days later, it has turned into a sad, black, slimy mess that goes straight into the bin.

When you are trying to be careful with your budget, throwing away food is literally throwing away money.

The Quick Answer: Yes, you can easily preserve fresh mint. For short-term use (up to three weeks), store it upright in a glass of water in the fridge like a bouquet of flowers, covered loosely with a plastic bag. For long-term preservation, you can freeze chopped mint in ice cube trays with oil or water, or dry the leaves out completely to store in an airtight jar in your cupboard.

Below, we will walk through exactly how to stop your mint from going off, how to prep it properly, and even how you can use this simple trick to help your bank balance.

When you talk about side hustles and making money online, preserving herbs might seem like an odd topic. But anyone who has successfully built extra income streams knows that managing your outgoing expenses is just as important as increasing your incoming cash.

Beating the Supermarket Trap

Supermarkets in the UK typically charge between £1.00 and £1.50 for a small plastic packet of cut herbs. If you buy fresh herbs once a week and end up binning half of them, you are throwing away upwards of £40 a year on mint alone. If you do this with coriander, parsley, and basil too, it quickly adds up. Learning to preserve what you buy—or better yet, growing a £2 potted mint plant and preserving the excess—frees up cash you can invest in your online business, a new domain name, or just your savings account.

Turning Mint Into Extra Cash

If you happen to have an allotment or a garden, you probably already know that mint grows aggressively. It spreads like a weed. Instead of hacking it back and composting it, you can preserve it for profit.

Dried, homegrown mint can be packaged into small, attractive tins or paper pouches and sold locally at car boot sales, farmers’ markets, or even on Etsy as artisanal herbal tea blends. You are not going to become a millionaire selling mint leaves, but turning garden waste into a small product-based side hustle is a brilliant way to dip your toes into e-commerce without risking any upfront capital. You can also pot up small runner cuttings and sell the live plants on Facebook Marketplace or Gumtree for a couple of quid each.

Short-Term Storage: Keeping Fresh Mint Alive in the Fridge

If you plan to use your fresh mint within a couple of weeks, you do not need to freeze or dry it. You just need to stop the cold, dry air of your fridge from destroying the delicate leaves. Here are the two most reliable methods to keep mint fresh.

The Glass of Water ‘Bouquet’ Method

This is by far the most effective way to keep mint crisp and green for up to three weeks. You are essentially treating the herbs like a bunch of cut flowers.

1. Trim the stems: As soon as you get your mint home, use a sharp pair of scissors to snip the bottom centimetre off the stems. Remove any lower leaves that would sit below the water line, as these will rot and foul the water.
2. Find a small jar: A clean jam jar or a small water glass works perfectly. Fill it with about an inch of cold tap water.
3. Insert the mint: Stand the mint stems upright in the water.
4. Tent with plastic: Take a small, clear sandwich bag or the bag the mint came in, and place it loosely over the top of the leaves. Do not seal it tight; you just want to create a mini greenhouse environment to lock in humidity.
5. Store in the fridge: Put the jar in the fridge, ideally not right at the back where it is coldest, as the leaves might freeze. Change the water every three to four days.

The Damp Paper Towel Trick

If your fridge lacks the vertical space for a standing jar, this method is your next best option. It takes up very little room and keeps mint fresh for about ten days.

1. Sort the mint: Go through the stems and pull off any leaves that are already bruised, brown, or mushy. One rotting leaf will quickly spread moisture and ruin the rest.
2. Dampen some kitchen roll: Tear off a sheet of kitchen roll and run it under the tap. Squeeze out as much water as you physically can. It needs to be barely damp, not dripping wet.
3. Wrap the herbs: Lay the mint stems on the damp paper towel and roll them up gently, like a loose cigar.
4. Box it up: Place the wrapped bundle into a plastic food storage container or a zip-lock bag. Leave the seal slightly open so the mint can breathe, and lay it flat in your crisper drawer.

Long-Term Storage: Freezing Your Mint

If you have a massive harvest from your garden, or you simply know you will not use that supermarket packet anytime soon, freezing is the way to go. Freezing alters the texture of mint—it will become limp once thawed—so it is not suitable for garnishing a cocktail. However, it retains its flavour perfectly for cooking, sauces, soups, and marinades.

The Ice Cube Tray Hack

This is a classic preservation method that gives you convenient, pre-portioned amounts of mint ready to drop straight into a hot pan or a blender.

1. Wash and dry: Rinse the fresh mint under cold water to remove any dirt or bugs. Pat the leaves entirely dry with a clean tea towel.
2. Chop finely: Remove the leaves from the tough stems and chop them up.
3. Fill the tray: Push a pinch of the chopped mint into each compartment of a clean ice cube tray.
4. Add liquid: You can top the compartments up with either cold water or olive oil. If you plan to use the mint in cooked savoury dishes (like a lamb roast or a stir-fry), use olive oil. If you want to drop the cubes into a smoothie, iced tea, or to make homemade mint sauce, use water.
5. Freeze and store: Put the tray in the freezer. Once the cubes are solid, pop them out and transfer them to a labelled freezer bag so you can reclaim your ice cube tray. They will keep their flavour for about six months.

Flash Freezing Whole Leaves

If you want to keep the leaves whole for throwing into a teapot or a blender later, flash freezing prevents them from clumping together into one giant ice block.

1. Prep the leaves: Strip the flawless leaves from the stems. Wash them and dry them thoroughly. Any surface water will form ice crystals and cause freezer burn.
2. Arrange on a tray: Lay a sheet of baking parchment over a flat baking tray or a large plate. Spread the mint leaves out so they are not touching one another.
3. Flash freeze: Place the tray flat in the freezer for about an hour.
4. Bag them up: Once the leaves are stiff and frozen solid, quickly sweep them into an airtight freezer bag, squeeze out the excess air, and put them back in the freezer. You can now grab a handful of whole leaves whenever you need them without them sticking together.

Whipping Up a Freezable Mint Butter

If you are looking to save time on meal prep, making a compound butter is an excellent practical step. It is also something you can package in wax paper and genuinely sell at local food markets if you are exploring small-scale food hustles.

1. Let a block of unsalted butter soften at room temperature.
2. Finely chop a large handful of fresh mint leaves.
3. Mash the mint into the soft butter using a fork. Add a pinch of sea salt or a dash of lemon juice if you like.
4. Spoon the mixture onto a sheet of cling film or baking parchment, roll it into a tight log, and twist the ends.
5. Pop it in the freezer. When you are cooking new potatoes, peas, or searing a piece of lamb, you can just slice a coin of frozen mint butter off the log and let it melt over the hot food. It lasts for up to three months.

Drying Mint for the Pantry (and for Profit)

Drying mint is the most versatile storage method. Dried mint does not take up freezer space, it lasts for up to a year, and it is the exact format you need if you want to make your own herbal teas or start a small tea-blending side hustle.

Classic Air Drying

This requires zero electricity and is the most traditional way to preserve herbs. It works best if you have a warm, dry room with good air circulation.

1. Gather small bunches: Tie four or five stems of unwashed mint tightly together at the base using a piece of string or an elastic band. Remember that stems shrink as they dry, so an elastic band works well to stay tight.
2. Protect from dust: If your house is dusty, or you are hanging them in a kitchen with cooking fumes, you can carefully place a paper bag over the bunch. Poke a few holes in the bag for airflow and tie it loosely around the stems.
3. Hang upside down: Hang the bunches out of direct sunlight. Direct sun bleaches the colour and degrades the essential oils, leaving you with weak, flavourless mint.
4. Wait: Depending on the humidity in your home, it will take between one and three weeks. You will know they are ready when the leaves crumble easily between your fingers.
5. Store: Strip the dry leaves from the stems and store them in airtight glass jars in a dark cupboard.

The Oven Dehydration Method

If you live in a damp UK house where air-drying might lead to mould, use your oven. It takes a couple of hours and is very reliable.

1. Prep your trays: Strip the leaves from the stems and lay them flat on a baking tray lined with parchment paper. Ensure they are in a single layer.
2. Set the temperature: Turn your oven to its absolute lowest setting. If you have a fan oven, 50°C to 60°C is ideal. If your oven runs hot, prop the door open slightly with the handle of a wooden spoon to let moisture escape.
3. Bake: Leave the trays in the oven for 1 to 2 hours. Check them every 20 minutes.
4. Cool and test: They are done when they feel papery and snap when bent. Let them cool completely on the tray before putting them into jars; residual heat will cause condensation in the jar and ruin your hard work.

The Quick Microwave Hack

If you need dried mint quickly or just have a tiny handful to preserve, the microwave works surprisingly well. It is not ideal for bulk commercial prep, but it is great for quick household use.

1. Lay a piece of kitchen roll on a microwave-safe plate.
2. Place a single layer of mint leaves on the paper.
3. Cover with another sheet of kitchen roll.
4. Microwave on high for 30 seconds. Check the leaves.
5. Continue in 10-second bursts until the leaves are crisp. Usually, this takes under a minute.

Common Mistakes to Avoid When Storing Mint

Even with the best intentions, it is easy to ruin a batch of mint. If you are trying to cut down grocery waste or prep herbs to sell, making these simple errors will cost you time and money.

Washing Too Early

This is the number one reason supermarket herbs go slimy in your fridge. Moisture is the enemy of fresh storage. Unless you are dealing with a muddy haul straight from a garden, do not wash your mint until immediately before you plan to eat or freeze it. If you absolutely must wash it to remove bugs, use a salad spinner to dry it, then leave it on a towel for a few hours to ensure it is bone dry before it goes into the fridge.

Suffocating the Leaves in Plastic

When mint leaves ‘breathe’, they release moisture. If you tie them tightly inside a plastic bag with no ventilation, that moisture gathers on the sides of the plastic, drops back down onto the leaves, and causes rot. Whether you use the jar method or the damp paper towel method, always leave a small opening for air to circulate.

Ignoring the Stems

The stems carry water to the leaves. If you are using the jar bouquet method, make sure you snip the dried ends off before putting them in water. Just like cut flowers, the ends seal themselves over time. If you do not cut them, they cannot drink, and the leaves will wilt within 48 hours.

Storing Near Ethylene-Producing Fruit

If you keep your fresh herbs in the crisper drawer, make sure they are not sitting next to apples, bananas, or tomatoes. These fruits release ethylene gas as they ripen, which artificially speeds up the decaying process of leafy greens. Keep your herbs segregated if you want them to last.

Frequently Asked Questions (FAQ)

Can you revive wilted fresh mint?

Yes, if the mint is just droopy and limp (but not black or slimy), you can easily bring it back to life. Trim a centimetre off the bottom of the stems and plunge the entire bunch—leaves and all—into a bowl of ice-cold water for about 15 to 20 minutes. The cold water shocks the cells and allows them to rehydrate, making the leaves crisp again.

How long does preserved mint actually last?

Fresh mint in a jar of water in the fridge will last up to 3 weeks. Frozen mint in oil or water will keep its flavour for about 6 months. Fully dried mint, if kept in an airtight jar in a dark cupboard, will easily last a year (though its potency will very gradually decline over time).

Does dried mint taste different to fresh?

Yes, it does. Dried mint has a more concentrated, earthy, and slightly sharp flavour. Fresh mint tastes brighter and sweeter. Dried mint is excellent for dry rubs, brewing tea, and mixing into yoghurt dips like tzatziki. Fresh mint is better for garnishes, cocktails, and fresh salads.

Can I freeze whole stems of mint?

You can, but it is rarely worth the freezer space. The stems contains very little flavour compared to the leaves and they become incredibly woody and stringy once frozen. It is far better to strip the leaves off and compost the stems before you freeze them.

Final Summary

Learning to preserve fresh mint is a fast, straightforward habit that stops you throwing money into the compost bin. By treating fresh stems like a bouquet of flowers in your fridge, you can triple the lifespan of your supermarket herbs. If you have too much to use quickly, turning the excess into frozen cooking cubes or drying the leaves for homemade tea ensures absolutely nothing goes to waste.

Whether you are looking to shave a few pounds off your weekly grocery shop to fund a new side enterprise, or you plan to gather up garden mint to start a niche tea-blending hustle, mastering these basic storage tips is a great, practical step. Try out the water jar method this week, and you will quickly see why you never need to bin slimy herbs again.

FAQs

1. What is the best way to store fresh mint leaves?

The best way to store fresh mint leaves is to place them in a glass of water, cover the leaves with a plastic bag, and store them in the refrigerator. This will keep the leaves fresh for up to a week.

2. Can mint leaves be stored in the freezer?

Yes, mint leaves can be stored in the freezer. To do this, wash and dry the leaves, then place them in a resealable plastic bag and remove as much air as possible before sealing. Store the bag in the freezer for up to 6 months.

3. How should dried mint leaves be stored?

Dried mint leaves should be stored in an airtight container, away from light and heat. This will help to preserve their flavour and aroma for up to a year.

4. Can mint leaves be stored with other herbs?

Mint leaves can be stored with other herbs, but it’s best to keep them in a separate container or bag to prevent the transfer of flavours. Mint has a strong flavour that can easily overpower other herbs if stored together.

5. What is the best way to store mint leaves for long-term use?

For long-term storage, the best way to store mint leaves is to dry them. Once dried, store the leaves in an airtight container in a cool, dark place. This will keep the leaves fresh for up to a year.