Fresh or dried herbs in your nesting boxes not only work as insecticides, but also have anti-bacterial properties, and can act as natural wormers, anti-parasitics, insecticides, rodent control, and stress relievers.
Basil - antibacterial, mucus membrane health
Catnip - sedative, insecticide
Bee Balm (bergamot/monarda)- antiseptic, antibacterial, respiratory health, calming
Cilantro - antioxidant, fungicide, builds strong bones, high in Vitamin A for vision and Vitamin K for blood clotting
Dandelion greens - immune system stimulant
Dill - antioxidant, relaxant, respiratory health
Echinacea - immune system strengthener, disinfectant, wound healing properties
Fennel
Garlic
Lavender - stress reliever, increases blood circulation, highly aromatic, insecticide
Lemon Balm - stress reliever, antibacterial, highly aromatic, rodent repellent
Marigold - produces vibrant orange yolks, insect repellent
Marjoram - laying stimulant
Mint (all kinds) - insecticide and rodent repellent
Nasturtium - laying stimulant, antiseptic, antibiotic, insecticide, wormer
Oregano - combats coccidia, salmonella, infectious bronchitis, avian flue, blackhead and e-coli
Parsley - high in vitamins, aids in blood vessel development, laying stimulant
Peppermint - anti-parasitic, insecticide
Pineapple Sage - aids nervous system, highly aromatic
Rose Petals - highly aromatic, high in Vitamin C
Rosemary - pain relief, respiratory health, insecticide
Sage - antioxidant, anti-parasitic, general health promoter
Spearmint - antiseptic, insecticide, stimulates nerve, brain and blood functions
Tarragon - antioxidant
Thyme - respiratory health, antibacterial, antioxidant, anti-parasitic
Yarrow - antibacterial, anti-inflammatory, wound healer, clears sinuses and respiratory systems, stress reliever