Everywhere I drag the tractor, the chickens eat everything it covers. I have been using it to clear areas I want weeded out, and it's great! Mostly so far though it has been over tall grasses, (which they happily peck the seeds off!) Lambs Quarters, Dune Grasses, and lots of Milkweed, which they devour without apparent harm. So... if there ends up being a nightshade or lily of the valley in there, will they eat it and die?