Did you know that your coffee grounds are a great weapon against uninvited guests in your veggie beds and flower pots? It’s easy (and environmentally friendly) to protect your delicate plants from attacks by crawling and flying visitors. A good way to keep plant lice at bay, for instance, is a 1:1 mixture of coffee grounds and water. Simply boil the mixture again and once cool, spray over the little pests. Busted, beasts!