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what to put in a compost bin

You can turn most everyday kitchen scraps and garden waste into rich compost, as long as you balance “greens” and “browns” and keep out a few troublemakers.

Quick Scoop

  • Aim for about 1 part greens (wet, fresh, nitrogen‑rich) to 2 parts browns (dry, woody, carbon‑rich).
  • Chop things small, mix well, and keep the pile as damp as a wrung‑out sponge.
  • Avoid meat, dairy, oils, lots of glossy paper, and pet or human poo from meat‑eaters.

Think of your compost bin as a slow‑cooking stew: you’re layering ingredients so the microbes can do their work without turning the whole thing into a smelly mess.

What to Put in a Compost Bin (The “Yes” List)

Kitchen “greens” (nitrogen‑rich)

These are moist items that rot fast and “heat up” the pile.

  • Fruit and veg scraps and peels
  • Coffee grounds and paper filters
  • Tea leaves and paper tea bags (if they’re not plastic mesh; check the label)
  • Cooked, plain rice or pasta in small amounts
  • Bread and baked goods in small amounts (mix into the middle to avoid pests)
  • Crushed eggshells (they add calcium but break down slowly)

Garden “greens”

  • Fresh grass clippings (thin layers so they don’t get slimy)
  • Green plant prunings
  • Young, non‑seeding weeds
  • Spent annuals and deadheading from flowers

Brown, dry “browns” (carbon‑rich)

These keep the bin from turning into sludge.

  • Dry leaves
  • Shredded cardboard (plain, non‑glossy, no plastic tape)
  • Cardboard egg cartons, toilet roll tubes
  • Scrunched or shredded plain paper and paper towels
  • Straw, hay, dry plant stems
  • Small twigs and woody prunings (best if chopped or shredded)

Other surprising “yes” items

  • Hair and pet fur (from healthy animals)
  • Fingernail and toenail clippings
  • Natural corks and wooden toothpicks
  • Small amounts of wood ash from untreated wood
  • Bedding from herbivore pets (rabbits, guinea pigs, hamsters) using paper, straw or wood‑shaving litter

A simple habit: every time you add a bowl of kitchen scraps (greens), top it with a handful or two of shredded cardboard or dry leaves (browns). This keeps smells and flies down.

What NOT to Put in a Compost Bin

These items either attract pests, smell bad, or can harm your soil.

  • Meat, bones, fish
  • Dairy: cheese, milk, yogurt, butter
  • Oily or greasy foods, lots of salad dressing or frying oil
  • Large amounts of cooked food, especially salty or very sugary stuff
  • Pet or human feces (cats, dogs, litter from meat‑eating pets)
  • Diseased plants or plants heavily sprayed with persistent pesticides
  • Weeds that have gone to seed, or invasive weeds with tough roots
  • Charcoal briquettes or ash from treated or painted wood
  • Glossy, coated, or heavily colored paper and cardboard
  • “Compostable” bioplastics that are only certified for industrial facilities (they often don’t break down well in home bins)

If you’re ever unsure, leave it out or look up whether it’s safe for home composting in your local conditions.

Easy Green/Brown Ratio Cheat Sheet

Here’s a quick at‑a‑glance guide you can save:

html

<table>
  <thead>
    <tr>
      <th>Category</th>
      <th>Good to Put In</th>
      <th>Keep Out / Be Careful</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Kitchen scraps</td>
      <td>Fruit & veg peels, coffee grounds, tea leaves, small amounts of bread/pasta, crushed eggshells[web:3][web:5]</td>
      <td>Meat, fish, bones, dairy, oily food, large amounts of cooked leftovers[web:2][web:6][web:10]</td>
    </tr>
    <tr>
      <td>Garden waste</td>
      <td>Grass clippings, green prunings, non‑seeding weeds, dead flowers, dry leaves[web:1][web:5][web:7]</td>
      <td>Diseased plants, seeding or invasive weeds, big woody branches[web:6][web:7]</td>
    </tr>
    <tr>
      <td>Paper & cardboard</td>
      <td>Shredded paper, plain cardboard, egg cartons, paper towels (not soaked in chemicals)[web:1][web:3][web:5]</td>
      <td>Glossy/magazine paper, cardboard with plastic coatings or lots of tape[web:2][web:8]</td>
    </tr>
    <tr>
      <td>Other materials</td>
      <td>Hair, pet fur, herbivore pet bedding, small amounts of wood ash, natural cork[web:3][web:6][web:9]</td>
      <td>Dog/cat waste, litter from meat‑eating pets, ash from treated/painted wood[web:2][web:6][web:8]</td>
    </tr>
  </tbody>
</table>

Simple Compost Routine (Step‑by‑Step)

  1. Start the base
    • Put a loose layer of twigs or straw at the bottom so air can flow.
  1. Add greens
    • Toss in a bucket of kitchen scraps or a layer of grass clippings.
  2. Cover with browns
    • Add two buckets (or a thick handful) of dry leaves, shredded cardboard or paper.
  1. Keep it moist
    • Aim for damp, not soggy; add water if it’s dry, more browns if it’s wet.
  2. Turn sometimes
    • Every couple of weeks, mix the bin with a fork or aerator to add oxygen and speed breakdown.

Over the past few years, home composting has become a trending “micro‑climate action” habit: people share bin photos, troubleshoot smelly piles on forums, and compare how fast they can make “black gold” for their gardens.

On many composting forums, you’ll see the same tip repeated: “When in doubt, add more browns.” It’s the simplest way to fix smells, flies, or a slimy pile.

TL;DR

For a healthy compost bin, load it up with fruit and veg scraps, coffee grounds, tea leaves, grass clippings, and lots of dry leaves, cardboard and paper, while skipping meat, dairy, oils and pet poo.

Information gathered from public forums or data available on the internet and portrayed here.