Posted: 03/06/2015 at 13:56
It's a herbaceous perennial not a shrub. It dies back to nothing at the end of the season. It's tall and impressive in flower, takes up a lot of space at that time and dies back to brown stems and rather manky(spelling?) leaves. It's in the cabbage family and smells like it when the dying leaves get wet.
It's one of the plants on my get rid of list