Believe it or not, I have a "desert weed garden" but the adults like my lawn much better. Not sure of the names of the weeds but folks go out in to the desert to collect seeds. Bermuda grass has been found to have exactly what they need. Most grasses are just fine. Generally speaking, store bought veggies are too high in protein and ya never quite know what kind of chemicals are on them. 10 percent protien is just about the max. Too much protien cause shell disfiguration and liver and kidney damage. Calcium is the only accepted supplement. Sweet fruit, lettuce, and most pet foods are big no-no's. Even prepared turtle and tortoise food is highly specialized for different species. Rule of thumb is that if it ain't found in the desert do not feed it desert torts.
Hatchlings happen Sept/Oct. Controlled incubation is 14 weeks or thereabouts depending on temps. One study showed that they appear after heavy rains. Whether they've hatched and are just waiting for the ground to soften to dig their way out of 8 to12 in deep nest holes, or if the rain simply fires up their insinctual need to eat is unknown. 2 to 12 eggs per hole is normal.
Speaking of which, time to go play rainman as the sun is just coming up. Then it's sit quiet with binocs and wait.