- Black walnut tree leaves or twigs releases substances that might be harmful to plants
- Coal or charcoal ash might contain substances harmful to plants
- Dairy products (e.g., butter, egg yolks, milk, sour cream, yogurt) create odor problems and attract pests such as rodents and flies
- Diseased or insect-ridden plants might survive and be transferred back to other plants
- Fats, grease, lard, or oils create odor problems and attract pests such as rodents and flies
- Meat or fish bones and scraps create odor problems and attract pests such as rodents and flies
- Pet wastes (e.g., dog or cat feces, soiled cat litter) might contain parasites, bacteria, germs, pathogens, and viruses harmful to humans
- Yard trimmings treated with chemical pesticides might kill beneficial composting organisms
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