What can't bearded dragons eat?

Don't feed citrus or anything you would find in your backyard, due to the fact that anything can get on grass, weeds, flowers anything like that outside. It's also not a good idea to collect crickets from outside due to the fact that you don't know what they might have been into before.

Also do not give your dragon Iceberg Lettuce it has little to no nutritional value what so ever. It is basically water. Also keep house plants away from your dragon.

This previous answer said only feed food that you get in the pet store...but honestly I've never seen a petstore that carries fresh carrots, kale, romain lettuce among other produce that dragons can eat. So grocery stores should be just fine.