Exposed food, like these oranges, will attract pests. Composting You do not have to have a bin to have a compost system. A compost heap can be created anywhere in your yard, it's simply a collection of compostable materials placed in a designated area. However, bins help keep the compost neat and tidy, and may help you exclude pests if they are a problem. Many people know the value of worms in their garden.
Worms are great decomposers, especially red-wigglers and African night crawlers.