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Coffee a Good Substitute for Manure in the Garden
July 17, 2008
Coffee grounds can be an excellent addition to a compost pile. The grounds are relatively rich in nitrogen, providing bacteria the energy they need to turn organic matter into compost.
About two percent nitrogen by volume, used coffee grounds can be a safe substitute for nitrogen-rich manure in the compost pile, explained Cindy Wise, coordinator of the compost specialist program at the Lane County office of the Oregon State University Extension Service.
"A lot of people don't want to use manure because of concerns about pathogens," she said.
Contrary to popular belief, coffee grounds are not acidic. After brewing, the grounds are close to pH neutral, between 6.5 and 6.8. The acid in the beans is mostly water-soluble, so it leaches out into the brewed coffee.
Since 2001, Wise has trained and coordinated OSU compost specialist volunteers who have collected and composted nearly 200 tons of coffee grounds from 13 coffee shops and kiosks in Eugene, Springfield, Florence, Cottage Grove, and Veneta. That's the equivalent of about 25 large dump trucks full of coffee grounds.
Lane County alone is estimated to generate 1 million pounds of used coffee grounds per year, Wise said.
"Recycling this valuable soil amendment and compost ingredient makes sense both economically and environmentally," she said.
Wise is encouraging gardeners and those that compost in other communities to arrange to collect coffee shop grounds for composting. But be sure to make prior arrangements with a coffee shop to collect grounds. Then, take a clean five-gallon bucket with a lid, label it with your name and telephone number on the bucket and lid and leave it at the shop and then pick it up at the shop's convenience.
Here are some suggestions for using composted grounds in the yard and garden from the OSU Extension compost specialists:
- Mix grounds into soil as an amendment. Make sure to keep them damp. Add some nitrogen fertilizer if you do this, as coffee grounds encourage the growth of microbes in the soil, which use up nitrogen. While microbes are breaking down the grounds, the nitrogen will provide a source of nutrients for your plants.
- Spread grounds on the soil surface, then cover them with leaves or bark mulch.
- Add grounds to your compost pile, layering one part leaves to one part fresh grass clippings to one part coffee grounds, by volume. Turn once a week. This will be ready in three to six months.
- Or, put them in an existing unturned pile. Just make sure to add a high carbon source, such as leaves to balance it.
- Grounds may be stored for future use. They may develop molds but these appear to be consumed during the composting process. Or a large plastic bag works for storage as well.
Paper coffee filters may be composted with the grounds.
Article courtesy of http://www.eponline.com
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