According to a Dietitian

Leftover diluted coffee can create a liquid plant fertiliser too. Other used for coffee grounds include using it to keep slugs and snails away from plants. 7 Ways To Use Coffee Grounds In The Garden Uses For Coffee Grounds Coffee Grounds Growing Vegetables You can scratch it into the top couple inches of soil or just sprinkle the grounds on top and leave it alone. Coffee grounds in the garden . Shrubs like roses and small lemon trees also thrive in acidic soil. The theory is that the caffeine in the coffee grounds negatively affects these pests and so they avoid soil where the coffee grounds are found. How to Use Coffee as a Fertilizer. Careful when adding them to your vermicompost bin though as the matter may harm the organisms. Coffee Grounds As a Garden Amendment. However there are some drawbacks to using coffee grounds in the garden and some instances where they should be avoided. A quick search for Using coffee grounds in the garden and Google will unleash a