The biodiversity in your yard and garden will contribute to the pleasure you gain from growing herbs, but some wildlife will be beneficial, while others may appear to be incurable pests.
Barriers are a very useful way of preventing pests from getting to your prized herbs, let alone damaging them. Most are designed to counteract the pest by being uncomfortable to cross or impossible to jump or climb over. Copper tape supposedly gives slugs a small but harmless electric shock, while bands of vaseline or grease make movement difficult for slimy creatures. Take care to remove fallen vegetation as this can create a bridge that will soon be discovered and exploited to the full. Sharp sands, gravels, and ground-up eggshells are used relatively successfully to restrict snail damage. Used on their own, each provides a modicum of protection, but if used in conjunction with biological control and considered use of slug pellets, any damage will be minimal.
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