Tomato leaves are not good for chickens. Horn worms eat pepper plants and tomato plants too. Would the diet of tomato leaves make the worm unhealthy for a chicken to eat? Found a horn worm in our garden 2 days ago & put it in a container for observation/decision. It's a big one! On a side note: I've been putting a bowl of water on the patio for the girls because it's been hot, an extra to the bowl in their coop area. The past 3 nights it's been getting muddied... I knew right away what it was (patpatpat of little hands) then watched him the 2nd night, caught him the 3rd night... yes they are cute but danger to the girls. So glad I saved the heart trap; byebye raccoon - YAY ME!