It's important to preface that snails are a valuable part of a healthy ecosystem, and can be very helpful in a garden as, for example, they can help turn plant waste into compost. Therefore ...
Most of the slugs and snails that eat your garden are not native. They live where they are unseen - in the fallen leaf litter, under mulch and around dark, damp places. At night, they munch on ...
Use only soil or potting compost and keep this as a supplement, rather that the main part of the plant’s diet ... of your garden every day and make sure it is mostly slug and snail free.