Pretty big. It would likely be a better idea just to buy the b stock from surrounding farms for extremely cheap rather then growing a garden. Farms usually throw out their b-stock because no one buys it (We only buy the perfect fruits or veggies). There is nothing wrong with them, we just don't buy them, so the farms throw them out. They usually get nothing for it, so offering them even a very low amount would be appealing (Especially because you are doing it for a good cause). Hell, if you promise to cart their veggies off so that they don't have to hire someone to dispose of it, you may be able to get it for free.