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, stress relievers and laying stimulants. Here is a partial list of common herbs and flowers and their beneficial properties:
CHICKENS !!! Tilly's Nest: Heat Stress Spa treatment. I take a shallow disposable pan, fill it with ice water and then sprinkle in some fresh herbs. The fresh herb make this absolutely irresistible. The girls enjoy standing in it. Drinking from it and sampling cool refreshing treats. I know that it is a welcomed guest in the run on hot days like this.