The research of Ohio State University found that coffee grounds contain about 2% nitrogen, which can transform organic matter into fertilizer. It is a safe and environmentally friendly fertilizer. Whether coffee grounds are dry or wet, they can provide nutrients for plants as long as they are laid flat on the top layer of soil and allowed to decompose by themselves, but it is not recommended to use them in large quantities.

Other wonderful uses of coffee: moisture absorption and deodorization.

Coffee grounds have many tiny pores, which can absorb moisture and deodorize. Put the dried coffee grounds in a cup and put them in a refrigerator or microwave oven to remove the mixed smell of various foods; It can be placed in the toilet to replace chemical fragrance; It also has a good deodorizing effect in wardrobes, shoe cabinets and cars. It is best to replace it every two or three days to avoid mildew after absorbing water.

Reference to the above content: People's Daily Online-Coffee grounds have three wonderful uses that are unknown to people.