A bit of a novice gardener here so please forgive the silly questions.
We have an established Mahonia in the back garden. It must be 8-9 foot tall consisting of 3 main stems and seems very lanky compared to others that I've seen. I was wondering what the advide would be about cutting it back in order to promote a better spread. My first inclination would be to saw it back to half height and see what happens.
Also if I am to prune it when is the appropriate time?
Any advice would be appreciated.