Citrus peels are one of the most useful kitchen scraps you’ll ever throw away. They contain d-limonene, a natural solvent that cuts through grease, along with high concentrations of flavonoids, vitamin C, and aromatic oils that make them valuable for cooking, cleaning, gardening, and more. Here’s how to put them to work.
Make a DIY All-Purpose Cleaner
The d-limonene in citrus peels is a naturally occurring solvent that breaks down and lifts oil from dirty surfaces. To harness it, pack citrus peels into a glass jar, cover them with white vinegar, and let the mixture infuse for two to three weeks. Strain out the peels, dilute the liquid 1:1 with water in a spray bottle, and you have a degreasing cleaner that works on countertops, stovetops, and glass. The vinegar does its own disinfecting work while the citrus oils handle grease and leave the room smelling sharp and clean.
You can also toss a few fresh peels into the bottom of your garbage disposal with ice cubes and run it to clear buildup and eliminate odors. The oils released during grinding coat the interior and leave a fresh scent that lasts for days.
Cook and Bake With Them
Citrus zest is the outermost colored layer of the peel, and it’s packed with aromatic oils that add brightness to nearly any dish. A microplane or fine grater lets you shave it directly into pasta, salad dressings, marinades, baked goods, or cocktails. Lemon zest lifts the flavor of roasted vegetables. Orange zest deepens chocolate desserts. Lime zest sharpens salsas and curries.
For a longer-lasting ingredient, try candied citrus peel. Cut the peel into strips, blanch them in boiling water two or three times to remove bitterness, then simmer in a simple syrup made from equal parts sugar and water (two cups of each works well for several oranges’ worth of peel). Once the strips turn translucent, dry them in an oven set to about 175°F for an hour. The result is a chewy, sweet garnish for cakes, ice cream, or snacking on its own. Dipped in dark chocolate, they make a surprisingly elegant gift.
You can also dry zest for your spice rack. Spread freshly grated zest on a parchment-lined tray and leave it at room temperature for a day or two, or use a dehydrator or low oven. Stored in a sealed jar away from light and heat, dried zest keeps its color, flavor, and aroma for over a year.
Add Them to Compost
A persistent myth says citrus peels are too acidic for compost bins and will kill beneficial organisms. In reality, citrus breaks down like most other organic material. Compost naturally swings between acidic and alkaline at various stages of decomposition, and the finished product typically settles into a pH range of 6 to 7 regardless of what went in.
Earthworms are often cited as the reason to avoid citrus, but this concern is overstated. Worms may not rush toward fresh peels, but they don’t enter the decomposition process until later stages anyway. By then, bacteria and fungi have already broken down the citrus enough that worms consume it without issue. If you’re vermicomposting (using a worm bin), just chop the peels into smaller pieces so they break down faster, and avoid dumping huge quantities at once.
Use Them in the Garden
Scatter small pieces of citrus peel around the base of plants to discourage cats, slugs, and aphids. Many soft-bodied insects dislike the oils, and cats tend to avoid the strong scent. This isn’t a guaranteed pest barrier, but it’s a free, chemical-free first line of defense worth trying before reaching for anything stronger.
You can also steep citrus peels in water overnight and use the liquid to water acid-loving plants like blueberries, azaleas, and gardenias. The slight acidity gives them a gentle boost without dramatically altering your soil pH.
Freshen Your Home Without Sprays
Simmer citrus peels on the stove with water, a cinnamon stick, and a few cloves for a natural air freshener that fills your kitchen in minutes. Unlike commercial sprays, you control exactly what’s in the air. Orange and clove is a classic fall combination. Lemon and rosemary works well in warmer months. Keep the pot topped up with water and it can run for hours on the lowest heat setting.
Dried peels also work as fire starters. The oils in citrus peel are flammable enough to catch quickly and burn long enough to ignite kindling. Toss a few dried strips into your next campfire or fireplace for an easy start and a pleasant scent.
Make Infused Oils and Vinegars
Citrus-infused olive oil is simple to make and useful in the kitchen. Add strips of dried peel (fresh peel contains water that can encourage bacterial growth) to a bottle of olive oil and let it sit for one to two weeks. Use it for salad dressings, drizzling over fish, or finishing roasted vegetables. The same approach works with vinegar: add peels to white wine vinegar for a citrus vinaigrette base that keeps for months.
Cleaning Pesticides Off the Peels
If you plan to eat the peel or use it on your skin, cleaning it properly matters. A baking soda solution is the most effective method for removing surface pesticide residues, outperforming both plain tap water and bleach-based washes. Dissolve about a tablespoon of baking soda in two cups of water, soak the fruit for 12 to 15 minutes, then rinse under running water.
This removes pesticides sitting on the surface, but some chemicals, particularly systemic pesticides like thiabendazole (commonly used on citrus), penetrate into the peel itself and can’t be fully washed off. Buying organic citrus is the most reliable way to minimize pesticide exposure when you intend to use the peel. If organic isn’t available, the baking soda soak still significantly reduces what you’re exposed to.
A Caution for Skin Care Uses
You’ll find plenty of suggestions online to rub citrus peels on your skin or make citrus peel face scrubs. This comes with a real risk worth knowing about. Citrus peels contain compounds called furanocoumarins that can cause a painful skin reaction when combined with sunlight. This condition, called phytophotodermatitis, produces burns, blisters, and long-lasting dark patches on the skin.
Cold-pressed (expressed) citrus oils carry the highest risk. If you apply any citrus peel product to your skin, avoid sun exposure for at least 12 hours afterward. Bergamot oil is the most potent offender and has shown photocarcinogenic effects in animal studies. Furanocoumarin-free versions of citrus oils exist and don’t carry this risk, so look for those if you want citrus in your skincare routine.