Posted: 19/09/2016 at 23:28
Yes, prune it when you see new growth start in spring. If 8 feet tall is a problem, you probably have the wrong tree for the space, as that is really just a tiddler. M. Grandilfora will grow to well over 30ft tall and 20+ feet wide so you'll have a job to keep it small but still looking attractive. Pruned that way it will always be a bit sparse as far as the number of flowers goes because annual pruning will always remove a large proportion of flower-bearing wood. They can be wall-trained however and then the pruning is done in summer. Do not prune it between late summer and spring.