I am planning to grow cordon apples over a metal arch (so I think that makes them minarettes as they will be growing upright?). I intended to grow one either side of an arch which is about 5 foot wide, but it's about 3 foot deep so I wondered if I could grow a tree at each corner of the arch. I think the spacing for cordons is 2-3 feet but I don't want to risk overcrowding as I do have a tendency to want to squeeze in as many plants as possible, and I don't know if growing them upright rather than oblique makes a difference to the spacing. If anyone else has grown fruit trees over an arch please could you let me know what you think?
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