Posted: 23/04/2013 at 16:15
Strange you should say that about the pink ones Obelix. I've got two nice clumps which have been in the same spot for at least 15 years and have never spread, but the white ones, in a dry bed between a huge magnolia and a large red hazel where nothing else will grow , increase regularly. I just pull out what becomes too much.
I seem to remember that a few weeks back, someone on the forum said never plant anything with the word japanese in the name, you'll never get rid of it!