hello,
Yes I remember clearing a section of woodland on a project between that & Japanese Knot Weed in the same area.. OMG.
I think both were planted when there was a stately house in the area many years ago? we used this very effective 'blue dye'
root killer which was brushed onto the remaining stump of the 'Rhody' very effective. The Knot weed still grows in abundance in the
same area.
Regards
David