* Animal manure
* Cardboard rolls
* Clean paper
* Coffee grounds and filters
* Cotton rags
* Dryer and vacuum cleaner lint
* Eggshells
* Fireplace ashes
* Fruits and vegetables
* Grass clippings
* Hair and fur
* Hay and straw
* Houseplants
* Leaves
* Nut shells
* Sawdust
* Shredded newspaper
* Tea bags
* Wood chips
* Wool rags
* Yard trimmings
Source: U.S. Enviornmental