Many tortoise species are herbivores and therefore eat a lot of vegetable matter. What Jim Harding says about certain vegetables being harmful to tortoises would hold true for box turtles as well, IF all they ever ate were those items. However, if you feed any of those items sparingly and offered occasional vitamin supplementation and free access to calcium-there would be no problem in my opinion and from my experiences. So if you grow fresh spinach-go ahead and give them some once or twice during the growing season. You have left over broccoli from dinner and it's unsalted and not buttered-offer it to your turtles as part of their meal that includes a protein, fruit and leafy green. Variety keeps box turtles from becoming picky eaters and you will have more chances of getting the proper trace minerals into their diet. Tess