When I was a kid growing up my Ma had strawberries growing in a couple of truck tires. Every spring she always picked plenty for several strawberry & shortcake meals a few times each spring, plus plenty to freeze and eat on later in the year. Well I'm thinking of rigging up a couple of tractor tires and do the same thing for my sister-in-law. But am also thinking of planting something in the very center of the tire. But what kind of bush or small tree would go good inside but not shade the strawberry plants too much? Would something like dwarf apple or peach trees work? I'm thinking of having two tractor tires close together.