It is a natural antibiotic. This means that they inhibit the growth of bacteria. It is also an herbicide. It kills the weeds that compete with your crops. The coffee beans have insecticidal properties too.
Coffee grounds can also be sprinkled around plants to boost growth and prevent mold. One thing is certain; using coffee grounds as a fertilizer for plants is a smart and inexpensive way to add nutrients to the soil without the hassle of buying expensive products or paying for a subscription.
To keep the plant happy, you should be very careful when watering and fertilizing it. It will grow much better if you water it in the morning and give it some extra nutrition, rather than watering it at night and applying fertilizer.