I am ready to try growing buddleia again! Gardening just outside Ottawa, I had one that lasted a few years and then died (maybe a tough winter?). Now my plan is to plant my buddleia in a very sheltered warm spot on the south side of a brick wall PLUS the waste water pipe going out to the septic tank passes right under this bed. I figure this way, the top may die down but the roots will definitely survive. Has anyone else ever tried this trick?