1. Coffee is acidic and abrasive making it a wonderful yet natural slug deterrent. Sprinkle some coffee grounds around any slug-prone plants to keep the little pests away.
2. Coffee is a good fertilizer, using it by adding the grounds to the soil directly or by making a coffee 'tea'. You can do this by adding the grounds to a large bucket and filling with water. Leave the grounds to steep over night. This produces a concentrated liquid that can be used for giving a little boost to indoor plants or potted plants.
3. Coffee grounds can also help to produce good compost as it is a good source of nitrogen, a resource that most plants require in high quantities. Nitrogen is actually one of the elements that helps make plant green as it is a major component in chlorophyll.