Keep the pile as straight and as square as possible to conserve heat in the pile. Bins made of wire, snow fencing, or unmortared cinder blocks aid the process by confining the pile and conserving the heat and moisture. Small amounts of compost can be made by layering the material in large plastic garbage bags. The bag helps retain the heat and moisture and speeds the process. Open the bag occasional and stir the contents.
Decomposition requires oxygen.
The bag can be stored inside where the temperature is warmer than outside to produce usable compost in a shorter period of time. Compost is ready for use when the organic material has decomposed enough to begin to crumble when handled, but still retains its form. Compost for potting house plants should be screened and the rougher material returned to the pile or used on the garden You need not be concerned about when the compost is right for use. Once it starts to breakdown it can be used at any time.