Try to think what he would get in the wild. Mine loves dandelion greens from the yard,tall grasses from the yard,grape leaves,cilantro,strawberry leaves and parsley from the garden. And hay at all times.
Welcome from Pennsylvania! I also have a Flemish, named Pumpkin.
We were just in your part of the country on vacation. Enjoyed the San Juan Islands and the city of Seattle.
My Flemmish giant gets along just fine in the chicken coop and enclosed aviary. Ten bantam chickens, one big bunny! They are good companions, anyone else keep their buns with chickens?