As of January 1, 2024, households and businesses are required by the AGEC law to have access to a composting solution. This means that individuals and professionals must sort and deposit all organic waste appropriately. Composting is an excellent way to recycle garden waste and create nutrient-rich fertilizer. However, not all garden waste is suitable for composting, and it’s important to know which materials should be avoided. In this guide, we’ll help you avoid common mistakes and ensure your compost remains healthy and effective.

Why Some Garden Waste Should Not Go in the Compost

While composting is a fantastic way to recycle organic waste, not all materials are suitable for the process. There are several reasons why certain garden waste should be kept out of the compost bin:

  • Too thick: Materials that are too dense or large can slow down the decomposition process.
  • Too acidic: Some garden waste, like citrus peels, can be too acidic for compost.
  • Too slow to decompose: Some items take too long to break down and may disrupt the compost balance.
  • Contaminated or treated materials: Chemicals or contaminants can harm the compost or make it unsafe.

By avoiding these materials, you’ll help maintain the quality and effectiveness of your compost.

Non-Biodegradable Waste Should Not Be Composting

Certain non-biodegradable items should never be placed in your compost bin. These materials won’t break down naturally and can introduce harmful substances. Here’s a list of what to avoid:

  • Synthetic materials: Plastics, colored papers, and other synthetic waste don’t decompose in compost.
  • Fish and meat waste: These materials attract pests and take a long time to break down.
  • Shells of shellfish: These take a long time to decompose and can disrupt the composting process.
  • Oilseed shells: These are too slow to decompose and may hinder the compost’s balance.
  • Litter with pet excrement: Pet waste can contain harmful pathogens that are not suitable for compost.
  • Fats and oils: These substances are too greasy and can disrupt the composting process.
  • Plastics and glass: These are not biodegradable and should never be placed in compost.
  • Vacuum cleaner bag waste: Contains synthetic fibers and other non-biodegradable elements.
  • Ashes: Ashes, particularly from coal or treated wood, can affect the pH balance of your compost.
  • Treated wood sawdust: Wood treated with chemicals is not suitable for composting as it can contaminate the soil.

Specific Garden Waste to Avoid

While many garden waste items are perfect for composting, certain materials should be avoided for various reasons. Here are some examples:

  1. Diseased plants: If your plants are diseased, composting them could spread harmful pathogens throughout your garden. It’s best to dispose of infected plant material separately.
  2. Plants treated with pesticides: Pesticides can linger in compost and harm beneficial organisms in the soil. Avoid composting plants that have been treated with chemicals.
  3. Citrus peels: Citrus fruits are acidic and can make your compost too sour. If you do choose to compost them, make sure to cut them into small pieces to speed up the decomposition process.
  4. Conifer needles: Coniferous plants like pine, thuja, or cypress contain acids that can slow down the composting process. These should also be cut into smaller pieces to help break them down more quickly.
  5. Treated lawn mowings: If your lawn has been treated with herbicides or pesticides, avoid adding grass clippings to your compost. Otherwise, untreated clippings are great for adding nitrogen to the mix.
  6. Weeds gone to seed: Weeds that have gone to seed can cause new weeds to grow in your garden. It’s better to dispose of these separately to prevent spreading.

Final Tips for Composting Success

To make the most out of your composting efforts, remember to:

  • Shred or chop large or thick materials: This helps speed up decomposition and creates a balanced compost mix.
  • Balance green and brown materials: For optimal compost, mix nitrogen-rich “green” materials (like grass clippings) with carbon-rich “brown” materials (like dried leaves).
  • Keep moisture levels in check: The compost should be moist, but not soggy. Turn it regularly to aerate and speed up the process.

By following these simple guidelines, you’ll help your compost break down efficiently and produce rich, healthy soil for your garden. Avoiding certain garden waste items will ensure your composting efforts are both effective and environmentally friendly.

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