Natural Lice and Mite Prevention: Using Herbs in the Nest Box. Grow a blend of lavender, chamomile, bay leaves, oregano, peppermint, tansy, wormwood, marigold petals, spearmint, & catnip. put in nest boxes. This formula is antibacterial, anti-parasitic, calming, soothing & healing for chickens. Also mint to repel mice!