A ground cover annual mix terpene is a blend of fast-growing, fragrant annual plants designed to fill garden spaces, attract beneficial insects, deter pests, and enhance soil health, often featuring herbs and flowers rich in terpenes like basil, alyssum, and savory, which boost essential oils and offer pest control benefits for companion plants, creating a functional, aromatic understory. These mixes are used in vegetable gardens as a living mulch, leaving the ground ready for next season, unlike traditional cover crops.