In an earlier article, we told you why you should save autumn leaves and we gave you some basic information on composting. In another article, we gave you more details on what to put in your compost pile.
Today we’re going to give you more advanced information on composting. If you’re willing to put in a little bit of work, there are ways to speed up your compost pile.
David Clark, horticulturist, shared tips on composting at a recent seminar at the Buffalo and Erie County Botanical Gardens.
Clark teaches Horticulture I and Horticulture II Certificate classes at the Botanical Gardens.
Four key materials for a speedy compost pile
To speed up your compost pile, your main objective is to support the beneficial bacteria that break down the plant material. You want the bacteria to have the nutrients and conditions they need so they can work at a rate that heats up the pile. A warm compost pile will break down more quickly.
To do that, you need to maintain optimal levels of the four key materials of your compost pile.
High-carbon materials tend to be brown and dry, such as dried leaves, straw and wood chips.
High-nitrogen materials tend to be green, such as grass clippings, or colorful, such as fruit and vegetable peels. These materials also tend to be wet.
Decomposition can take place without oxygen, but the aerobic or oxygen-using process is more efficient than the anaerobic, or non-oxygen process. Also, the anaerobic process can be smelly.
Water is needed in the right amounts to keep the composting process moving along.
Mixture of materials
The most efficient composting occurs with a carbon-to-nitrogen mix of about 30:1.
Using the general guidelines, that means that you should have 30 times more dried leaves (measured by volume) in your compost pile than you have kitchen scraps.
Maintaining your compost pile
If you get your compost pile operating optimally, it will heat up. The optimal temperature is between 135 degrees and 160 degrees Fahrenheit. Getting your pile hot not only causes the plant material to break down more quickly, it can also kill weed seeds.
When your compost pile is breaking down optimally, water vapor will be released. You may even see the pile steaming.
“One spring, I had my compost pile smoking like a pasta pot,” Clark said.
Since water will be released from the pile, to keep it working optimally, you will need to add water back in.
Oxygen will also be depleted. The simplest way to add oxygen is to turn the pile with a pitchfork. Clark also suggests having a layer of sticks at the bottom of your pile to create air pockets and allow oxygen to enter.
The hotter the pile gets, the more often you will need to add water and oxygen. The air and water balance is critical to maintaining high temperatures.
However, too much water can slow down the process. If your pile gives off a bad smell, that’s a hint that your pile is too wet.
Other composting tips
- Locating your pile in the sun can help it warm up.
- Use rabbit pellets (the food that contains alfalfa) as a starter– that’s green material, Clark said.
- If you get fresh manure from a farm, it should be composted rather that placed directly on garden beds. Fresh manure is high in ammonia, which can burn plants.
- You can use newspaper in your compost pile. Most colored inks are now soy based, so they’re safe for composting, he said. Make sure you shred up the paper before you add it to your pile. If you add a full sheet of newsprint, six months from now you’ll still have a full sheet of newsprint.
- Breaking up your other materials into smaller pieces will also help speed up the composting process. Break up or cut up sticks and woody plant stems. Step on dried leaves or run them over with a lawn mower.