Holding units are simple containers used to store garden waste in an organized way until these materials break down. A holding unit is the easiest way to compost. It only requires placing wastes into a pile or bin as they are generated. Holding units contain organic waste until it breaks down. Non-woody materials such as grass clippings, crop wastes, garden weeds, and leaves work best in these systems.
Decomposition can take from six months to two years.
The process can be hastened by chopping or shredding wastes, mixing dry and wet materials, and maintaining proper moisture. Since yard and garden wastes will be added continuously, the stage of decomposition will vary from the top to the bottom of each compost pile. Generally, the more finished compost will be found near the bottom of a pile and partially decomposed materials near the top. Once the compost at the bottom of a pile is finished, it can be removed and used. Turning units are typically a series of bins used for building and turning active compost piles.