Espalier rootstock and spacing
I thought that I would only have room for one tree to avoid shading my vegetables, but then I realized that I have a long wall with a southeast exposure which receives sun from dawn until very late in the day. A new plan presented itself! If I were to plant along this wall (5' high and 30' long) what would be optimal spacing and what would be compatible rootstocks? I would like to grow stone fruit mostly and perhaps an apple or a pear or possibly a quince.