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    Home » Trending

    Published: Jul 25, 2025 by Kristen Wood · This post may contain affiliate links. If you make a purchase through links on our site, we may earn a commission. ·

    10 Things You Should Never Compost

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    Composting is a smart way to reduce waste and feed your garden naturally. But not all scraps and clippings are compost-friendly—some can do more harm than good.

    To keep your pile healthy and effective, steer clear of these ten items.

    Meat and Dairy Products

    Various high-fat foods including sausages, bacon, pork chops, potato chips, whipped cream, mayonnaise, butter, and a bottle of milk arranged on a dark surface.
    Photo Credit: Alex9500/Envato

    These items decompose slowly and produce strong odors that attract pests like raccoons and rats. They can also introduce harmful bacteria into your compost.

    Greasy or Oily Foods

    Trays of grilled and cooked seafood, including whole squid and shellfish, are displayed at a food stall.
    Photo Credit: wirestock/Envato

    Cooking oils and greasy leftovers don’t break down properly and can create a slimy mess. They also disrupt the balance of your compost pile.

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    Glossy or Coated Paper

    Curled sheets of colorful paper in shades of yellow, orange, red, green, and blue are arranged in overlapping waves.
    Photo Credit: shotsstudio/Envato

    Magazines, receipts, and coated cardboard contain inks and plastics that don’t belong in your soil. Stick to unbleached, non-glossy paper products only.

    Weeds That Have Gone to Seed

    Three plants with black berries atop long stems and several large, wilted yellow-brown leaves, set against a blurred green background of grass and foliage.
    Photo Credit: koldunova/Envato

    Adding weedy plants that are already flowering or seeding can cause an unwanted weed explosion later. Many seeds survive the composting process.

    Pet Waste (From Cats and Dogs)

    A person scoops clumped cat litter with a pink scoop from a blue litter box while a cat watches; a trash bin with a pink liner is nearby.
    Photo Credit: Garnar/Envato

    Feces from carnivorous pets can carry harmful pathogens and parasites. It’s best to dispose of it in the trash, not your compost.

    Cigarette Butts

    A pile of burnt cigarette butts and ashes overflowing from a black ashtray against a plain dark background.
    Photo Credit: fotozanemeiere/Envato

    These contain toxins and synthetic fibers that don’t break down and can harm soil health. Keep them far from your compost pile.

    Diseased Plants

    A close-up of several brown, dried leaves hanging from a branch, with green foliage and purple flowers blurred in the background.
    Photo Credit: Julia_Faranchuk/Deposit Photos

    Composting sick plants can spread fungi, bacteria, or viruses throughout your garden. Always trash diseased greenery to prevent contamination.

    Synthetic Chemicals or Treated Wood

    A close-up of a paintbrush applying a protective coating to a wooden plank outdoors, with grass visible in the background.
    Photo Credit: Kinek00/Envato

    Sawdust from treated lumber or grass sprayed with herbicides can leach toxic chemicals into your compost. Only use untreated and chemical-free materials.

    Seafood Shells and Bones

    An assortment of seafood including mussels, shrimp, and octopus arranged on a white surface.
    Photo Credit: indigolotos/Envato

    Like meat, these materials break down slowly and cause strong odors. They also risk attracting scavengers and slowing composting progress.

    Too Much Salted Food

    Assorted bowls of snack foods, including potato chips, popcorn, pretzels, pita chips, and spiral chips, arranged on a wooden table.
    Photo Credit: kasia2003/Envato

    Excessive salt in compost can damage your plants by affecting soil salinity. Avoid adding processed or salty leftovers.

    By avoiding these common composting mistakes, you’ll create richer, healthier soil for your garden. A little knowledge goes a long way when it comes to waste that truly nourishes.

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    About Kristen Wood

    Kristen is a plant lover, gardener, certified functional nutritional expert, cookbook author, writer, and photographer. Her work has been featured in many online and print publications including Willow & Sage Magazine, Forbes, NBC, New York Daily News, Healthline, MSN, Elle, Yoga Journal, and many more. She is also a syndicated writer for The Associated Press.

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    About Kristen Wood

    Kristen is a plant lover, gardener, certified functional nutritional expert, cookbook author, writer, and photographer. Her work has been featured in many online and print publications including Willow & Sage Magazine, Forbes, NBC, New York Daily News, Healthline, MSN, Elle, Yoga Journal, and many more. She is also a syndicated writer for The Associated Press.

    Learn more about me →

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