The rabbits here get a lot of different things from the yard. We've planted mulberry, the leaves are very nutritious. They also get ti leaf, assorted weeds (check to make sure they're bunny safe before offering them to the bunnies), grasses, and a lot of tree trimmings from things like citrus...
We've had really good luck growing veggies in raised bed gardens. Three to four layers of concrete building blocks, held together with old metal pipes and such jammed down the holes, lined with weedmat, filled with soil and topped with bunny fertilizer. This has been our 'go to' garden design...
It's about time to plant since winter equinox has come and gone. There's a new variety of dwarf yellow string beans just starting to come up. Some iris that I'd gotten last summer to try in an improper zone (it's zone 11B here and I don't know if iris can handle anything above a 9 or 10)...
We'd generally put a bushel of cut in half apples in the 'big pan'. Not sure of the size, but it was a really big soup pot maybe four or five gallons? Add a little water and steam cook the apples to soft. Then they'd be run through a ricer to make applesauce. About a case of that would be...
FWIW, most of our gardens wouldn't be able to be registered since they're not a collaborative community effort that is teaching gardening. Those are the sorts of gardens who can sign up on the USDA list.
From reading the article, the USDA isn't really asking folks to register their own home...