Used coffee grounds
Used coffee grounds are the waste product from brewing coffee. In the late 19th century, used coffee grounds were used to adulterate pure coffee.[1] In gardens, coffee grounds may be used for composting or as a mulch[2] as they are known to slowly release nitrogen into the soil. The coffee grounds are rich in potassium, magnesium and phosphorus. They are especially appreciated by worms and acid-loving plants such as blueberries.[3] Gardeners have reported the use of used coffee grounds as a slug and snail repellent,[2][4] but this has not yet been scientifically tested. Some commercial coffee shops run initiatives to prevent the grounds from going to waste, including Starbucks' "Grounds for your Garden" project,[5] and community sponsored initiatives exist, such as "Ground to Ground".[6]
Used coffee grounds have other homemade uses in wood staining, air fresheners, and body soap scrubs.[2] They may also be used industrially in biogas production or to treat wastewater.[7]
See also
References
- ↑ Pendergrast, Mark "Uncommon grounds : the history of coffee and how it transformed our world" 2010 Basic Books. ISBN 978-0-465-02404-9
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