The foods cannot go in compost bin setups are meat, fish, dairy, and oily or fatty scraps. These items rot too slow in a backyard bin. They create bad smells and draw pests that make your composting life miserable.
I tossed old cheese and leftover chicken skin into my bin one summer night. Within 48 hours, the smell got so bad my neighbor asked if something died in the yard. Fruit flies swarmed the lid by morning. I spotted raccoon scratch marks on the sides by day three. That one mistake took two weeks of brown material and extra turning to fix. The odor hung around long after the food broke down.
The biology behind these rules is straightforward. Fats and proteins need microbes your aerobic bin doesn't have many of. Greasy or meaty scraps create dense pockets where oxygen can't reach. Bacteria in those spots make hydrogen sulfide and other smelly gases. Those gases carry far enough to attract animals from across your block. Plant-based scraps break down faster because your bin's bacteria already eat cellulose and simple sugars well.
Here is the full breakdown of food scraps not for compost in a standard backyard bin.
Your compost bin food restrictions change based on what system you run. A hot setup that holds 130-150°F for weeks can handle small amounts of dairy and cooked grains. Worm bins have the strictest rules since red wigglers avoid acidic, oily, and salty foods. A standard outdoor bin falls in the middle and handles all your fruit and vegetable scraps, coffee grounds, and grains. Just keep animal products out of it.
If you want to handle all your kitchen waste, try a bokashi system alongside your regular bin. Bokashi uses a sealed bucket and special bran to ferment all food waste in about two weeks. You then bury the fermented scraps in soil or add them to your compost pile. They break down fast with no smell or pest issues. I started running a bokashi bucket last spring and now zero food waste leaves my kitchen for the trash. The two systems cover every scrap my household makes and I wish I had started both sooner.
Read the full article: 8 Best Compost Bins for Every Garden
