I have a Buddleia growing at the front of my house. It wasn't planted, it's growing wild and, if I don't do something, it will grow into a bush that will crack my foundations. What can I do to kill it? I didn't notice it till it was already established, the stem is prob about 3/4 inch thick.
I have 2 in my back garden to keep the butterflies happy, so this one has to go.
Thanks