Is coffee good for all plants?

No, coffee is not good for all plants. While coffee grounds can provide some nutrients for certain plants, such as nitrogen and potassium, they can also be harmful to others. The acidity of coffee grounds can lower the pH of the soil, which can make it difficult for some plants to absorb nutrients. Additionally, the caffeine in coffee can be toxic to some plants. Therefore, it is important to research whether coffee grounds are suitable for a particular plant before using them.