Buddleia from the flames
I recently cut down an old, leggy buddleia davidii in order to re-render the wall it was growing against in a S.E. facing garden. The trunk had become hollow for the most part, and it was on its last legs, despite continuing to flower quite well. I cut it down to ground level, expecting the roots not to survive.
I planned to dig it out and replace it after the rendering work, but a shoot has sprung from the roots. My question - if I maintain just the one shoot, would it ever grow into a viable bush? Or am I better off digging it out and planting anew/afresh?
Thanks in advance.