Drying and Freezing Herbs
Fresh herbs can transform meals, but many herbs die back in winter! Air-drying, microwave-drying, freezing, and mixing into vinegars and butters are all excellent preserving methods, and easy to do with small or large quantities of herbs. See our article (with video) on how to preserve herbs without sacrificing flavor.
Evergreen herbs such as rosemary may be picked throughout winter in many areas, but most herbs need to be cut and stored before the end of the growing season if we’re to enjoy their flavors during the colder months.
Drying is the easiest way to preserve herbs. Gather stems into small, loose bunches. Secure the ends together with an elastic band or twine then hang upside down in a warm, dry, well-ventilated place that’s out of direct sunlight. Herbs with smaller leaves, such as thyme, can be laid out on newspaper or on a rack to dry. For best results herbs should be fully dried within two to three days.
A speedier alternative to air drying is to use a microwave. This method is also useful in damp climates where air drying can prove difficult unless you have a dehydrator. Spread individual leaves out onto paper towel then cover with another layer of paper towel. Place into the microwave for one to three minutes, checking the leaves every 20 seconds and rearranging as necessary to ensure even drying. Allow to cool before storing. Herbs are dry when they are crunchy to the touch.
Storing Dried Herbs
Store dried leaves whole to retain their flavor. Place them into airtight jars, labelled with the name of the herb and the date. Store them in a cool, dry place where they should keep for up to a year.
Fleshy herbs such as basil, parsley, dill and cilantro lend themselves to freezing. Blanch them in boiling water for a couple of seconds before plunging into a bowl of ice-cold water to stop the leaves from cooking further. Pat dry between dish towels then pack the vibrant-green leaves into labelled freezer bags.
Herb Ice Cubes
Ice cube trays offer a convenient way to add recipe-ready portions of frozen herbs at cooking time. To freeze, add chopped herbs to the trays so that each cube is about half full. Top up with water then freeze as normal. This is also a great way to preserve edible flowers such as borage for adding to drinks. Once the cubes are frozen they can be popped out into a freezer bag to save on space.
You can also blend herbs with oil then pour the mixture into ice cube trays to freeze in the same way. This method also works really well for basic pestos – just make up your pesto, pour into the ice cube trays, freeze, then pop out and pack into freezer bags ready to add to your favorite recipes.
A variation on oil-herb mixtures is to make a herb butter. Leave a pat of butter at room temperature to soften up. Chop up your favorite leafy herbs – I love using tarragon! – then mash into the butter using the back of a fork. Pack the butter up into greaseproof paper and twist the ends closed. Herb butter can be kept in the fridge for two weeks or frozen for up to six months.
Vinegars and Oils
Herbs in oils and butters can exclude oxygen, which can increase the risk of botulism disease. To avoid this, be sure to refrigerate them and use within two weeks, unless you’re freezing them. An alternative is to lower the pH to below 4.6 by soaking finely shredded herbs in vinegar, then mixing in the oil to make salad dressings, which will last longer.
These ideas offer just a flavor of what you can do to lock in summer freshness to enjoy year round. Of course, there are lots of other methods such as blanching, preserving in sugar, and even herbal wines. If you’ve got a favorite method for storing herbs please share it in the comments section below.
Growing herbs? See our Herbs Growing Guides here.
Plan an herb garden next year! See the Almanac Garden Planning Tool.
Because the olive oil in pesto doesn't hard freeze, we store it in containers holding a cup or two of pesto. Then when pesto is needed for a recipe, simply scoop the amount of pesto needed out of the container and place the container back in the freezer, ready for the next meal. Great video on preserving herbs, thank you, especially blanching and ice cubing fleshy herbs. We'll try that.