Fruit trees (specifically the low maintenance natives) would make a rich source of nutrition for the poor and homeless. Fruits such as Pawpaws, Persimmons and Service berries are rich sources of potassium, vitamins and other essential nutrients. The fruit (with the possible exception of Pawpaw) could be dried and kept for long term use at public areas like soup kitchens, community centers and charitable organizations. Easy-cracking cultivars of Hickory, American Hazelnut and butternuts will provide a long term protein supply for these poor souls as nuts will not spoil quickly when properly stored. Naturally, you will have to make it unlawful for anybody but the unfortunate to use them.
Thank you for the interesting debate topic. However, I think it is absurd to say that only homeless and poor should be able to have fruit and nuts. This would also put many businesses out of business, including grocery stores, farms, juice companies, and fruit companies. This will put many out of work and hurt the economy.
By definition, the poor have a difficult time buying from grocery stores-so the "business" you speak of isn't really there. They wouldn't have many homeless or poor individuals buying from them either way.