A strange garden

Over the past few months, my husband has been talking about putting a sort-of garden in our backyard. Instead of the typical tomatoes or cucumbers, he wants blackberry bushes or Mulberry trees. Unfortunately our backyard is rather small. It might handle a few bushes but I don't think we'd be able to fit any fruit-bearing trees back there. Maybe we can think about those when we can finally afford to move to a larger house with a larger yard. An apple tree or a peach tree might be nice!