Could forum members please identify this intruder
A few months ago, a plant appeared in one of my borders, which I can't ignore any longer as it is beginning to over-compete with it's neighbours. It's leaves somewhat resemble Comfrey, but there are no flowers. The fully-grown leaves are about 16" long and 6" across at the widest point. It has formed a mound about 3' across and 1' high.