Composting is a natural process where organic material is recycled into a soil additive. Organic material, like kitchen scraps and yard waste, that goes to our landfill emits methane, a potent greenhouse gas. You can help by reducing your household food waste with composting in your back yard. The composting process requires: carbon-rich material “browns”, nitrogen-rich materials “greens”, oxygen, water, heat, and time.
Here is an overview of the steps for successful backyard composting:
Choose a location with good drainage (no standing water after a storm) and near a water source.
Build or buy a bin that allows for adequate airflow and has structure enough to hold up heavy material while not creating an anaerobic pile.
Add a base of brown waste (list below) about an inch deep.
Separate your kitchen scraps to be added to your pile. All organic material can be composted. To reduce the likelihood of pests and smells, keep to the advised list of accepted green waste below.
Mix browns and greens at a ratio between 2:1 and 5:1, then cover with a layer of browns.
Water as needed. A healthy compost pile will have a moisture content between 40-60%. To test this, take a handful from the middle and squeeze. It should feel like a damp sponge. If it’s slimy or when you squeeze water drips out, it’s too wet. If it doesn’t clump, it’s too dry.
Turn your pile with a spade every 7-10 days (more frequently in the summer and less frequently in the winter).
Check the temperature, before turning. Once the middle of the pile has reached 130 degrees F, the pile is curing and needs to sit for 3-4 weeks. Occasional watering is okay if the pile starts to look dry.
Finished compost can take anywhere from 2-12 months, the more compost you have, the faster the process will go. Using a higher nitrogen content will slow the process, but it will also reduce smells and detract pests. Composting can be tricky, but also rewarding, for best results be patient and mindful of what goes in!
Organic Material
Carbon: Nitrogen Ratio
Carbon-Rich Sources
Twigs, Branches, and Wood Chips
600:1
Fresh Sawdust
500-600:1
Fresh Sawdust
400:1
Cardboard
350-550:1
Paper Products
200-800:1
Office/Printer Paper
170:1
Shredded Newspaper
170:1
Bark
130-1280:1
Paper Towels
110:1
Wheat Straw
100:1
Hay
75:1
Corn Cobs
55-120:1
Pine Needles
60-100:1
Corn Stalks
60:1
Peat Moss
55:1
Straw
50-150:1
Dried Leaves
40-80:1
Nitrogen-Rich Source
Fresh Leaves
37:1
Nut Shells
35:1
Fruit Wastes
35:1
Wood Ash
25:1
Vegetable Wastes
12 to 20:1
Coffee Grounds
20:1
Grass Clippings
12 to 25:1
Alfalfa Hay
13:1
Do Not Compost These
Black walnut trees, leaves, or twigs
Coal or charcoal ash
Dairy products or eggs
Diseased or insect-ridden plants
Dryer lint or clothing
Fats, oils, grease (or any food cooked in them)
Food containers
Meat or fish including bones and scraps
Paper products (paper towels, bath tissue)
Pet feces or litter
Tea Bags
Yard trimmings with pesticides
Pictured, is an example of an upcycled compost bin. The materials used were old pallets, scrap corrugated metal roofing, chicken wire, and hardware (handles and hinges).