On Wed, 22 Oct 2008 14:37:09 +0100, Sacha wrote:

When I think the less garden-minded people here have actively promoted
the idea of planting *several* of these monsters, I'm quite relieved to
see a post that illustrates the trouble that's unleashed by putting one
of these in the wrong place!

Yebbutt the OP says 'invaded': it may very well not be his/her plant. If
it's a neighbours they might not appreciate his/her glyphosating it!