California Gardening: What is eating my Gaillardia?, 1 by Anniesfollies

Anniesfollies wrote:
I recently planted a few Gaillardia. At first something was eating the flower petals. About a week later something started eating the plants, too. We sometimes have rabbits but they always leave droppings and there are none now, there are no snail/slug trails, and there is no caterpillar poop. Attached is a photo of one of the plants and as you can see the chewed edges are very ragged. I looked up grasshopper chewing but they leave smooth edges. I want to move the plants to the back yard and plant something else that hopefully won't get eaten, but at this point I'm stumped. Any ideas?