There are two ways of composting, “Passive” and “Managed”.
Passive composting
This is really very basic. You have a compost bin; you throw in all the various kitchen scraps, yard waste and so on. Once in a while, you mix it up; weather, bacteria, fungi and time do the rest. Hopefully, each year, you will have useable compost. Often referred to as “The Lazy Gardener’s Compost”.
Managed composting
This requires more time and attention than passive composting, but the resulting compost will be ready sooner, and better quality. A managed compost pile is often referred to as hot compost since the pile heats up as it decomposes, thus speeding up the process.
A managed compost bin can be ready in just 6 weeks, however, unless you are using tumblers, in most cases useable compost will probably take 2 to 3 months. Chopping or shredding leaves and other materials will speed up the process drastically.
Most of the organisms that decompose organic matter in a compost bin are aerobic – this means they need air to survive, so air circulation is important. This can be done by mixing (turning the top and sides of the pile into the center) the pile up every 3 or 4 days, or when the compost begins to feel cool. Building a bin with slats allows air to enter the pile from the sides. Using both methods is best.
How fast you produce finished compost will be determined by what you add to your compost, if you chop it up and how you mix them together. Layering is a common technique, but in most cases, redundant if you hand mix the pile.
The temperature of your compost pile is critical – If it is warm or hot, everything is good. If it feels luke warm, decomposition has slowed down and you need to add more materials such as grass clippings, leaves or kitchen waste. If you prefer to be very precise with the management of your compost, a compost thermometer can be used see how well your compost is doing. They are not expensive and readily available. If you can’t buy locally, you will easily find them online.
Keeping your compost pile moist is important. Too dry, and the pile will not decompose as quickly. A compost pile should be moist, but not wet – add water or dry matter as required to maintain this balance. To much water will reduce air in the compost thus slowing down the decay process. A good sign of healthy compost is worms. Worms don’t like it too cold, too hot, too wet or too dry – they can be used to monitor the condition of your compost.
A new compost pile will begin to heat up within a few days as the microorganisms thrive and your pile begins to decompose. Ideally, your pile should heat to about 140-160 degrees to kill weed seeds and diseases that may be present in garden plants.