>>2395126Wormwood is a common herb, it grows into a large bush but is happy in a pot.
You can move the pot around to BTFO various insects and importantly if will drive off fleas, ticks and lice which your chickens will appreciate.
The best way to deploy it is like I mentioned just to cut off a few branches and scatter it, because it's a potent insecticide and you don't actually want to drive all insects out of your garden.