I have a hydrangea petiolaris which has been in a pot for about 6 years on a north facing wall. From the main thick 'stem' there are 4 branches which have grown to about 8 feet and are peeling beautifully. There are flowers but obviously not as many as if it was buried in the ground. Although regularly fed I want to change the soil in the pot and will need to prune the branches in order to move it - unless I smash the pot, which is a bit drastic. I've read of the problems this will cause the plant but wonder if anyone has taken drastic measures with this plant in a pot and what was the result.
Any advice would be appreciated. Thank you.