Hi! I am widening my borders and would like to put a larger tree/shrub in one corner. (the border has a fence behind it, and a small concrete wall where the garden is split into two levels, both of which I'd like to hide a bit!) It is north facing, and shaded by the fence. The soil is good and slightly clay. I fancy a little fruit tree, possibly a morello cherry or a plum? Or something else entirely! What do you reckon?