Coffee grounds are very beneficial for plants due to their nutritional value and ability to improve soil quality. They are rich in nitrogen, which is an essential element for plant growth, and also contain important minerals such as potassium and phosphorus. Mixing grounds into compost speeds up the decomposition process and makes the food more nutritious. They also help improve soil structure by promoting better aeration and drainage. Grounds of "black gold" can be used as a natural product when applied directly to the garden, helping to retain moisture and reduce weeds. However, it is important to use them sparingly to prevent further acidification of the soil.