All natural granules containing essential oils are ideal for outdoor use to deter snakes, rodents, ants, fire ants, flies, ticks, and spiders. Simply spread liberally in any outdoor area, crawl space, storage building, barn, stalls, etcâ€¦. Granules will remain effective for 6 months to one year in any weather or temperature conditions. Granules can also be sprinkled in trash cans or dumpsters to repel flies. Will not harm children or pets.