The microorganisms that break down organic material in your soil will happily do the same job in a compost bin. Your role as a composter is to provide the conditions for nature's crew of decomposers—the bacteria, fungi, and bigger creatures such as sow bugs and worms—to go to work. Browns, Greens, Air and Water are the "big four" that will keep every compost pile happy. We have some basic information about making compost below, for more details check out our Tools for Building Healthy Soil guide.
Directions for making compost:
This recipe works for mixing food scraps and yard trimmings together, and requires a rodent-resistant compost bin and active maintenance to prevent animal nesting and feeding.
Feed yard trimmings to your bin as you generate them by chopping them first into pieces 6” or smaller.
Food scraps need to be buried and mixed into the center of the pile.
Feed as often as you like but be sure to mix in enough browns to balance your greens, and always top with browns (never dump food and run!). To learn more about what you can put in your compost bin, click here.
Maintain compost by turning or mixing it about once a week, and keep it as moist as a wrung-out sponge.
Harvest rich, brown, finished compost by sifting out coarse, unfinished materials after 3 to 8 months.
How can you tell when compost is done?
It will look like soil and smell sweet and earthy.
The pile will shrink by 30-50 percent in volume.
Original materials are unrecognizable, except some persistent woody pieces.
We recommend “aging” your compost by letting it sit for six months before using.
- Cover with a tarp or keep in a sheltered space to protect from the rain and sun.
- Remove the tarp periodically to provide air.
NOTE: If unfinished compost is added to your soil, the decomposer organisms compete with plants for nitrogen, resulting in stunted plant growth and yellow leaves.
This video presents the basics about what to put in your bin, and how to build and maintain a compost pile.