Leftwood said: It may be difficult to contain the False spirea; you'll want to keep a watch on it.
I planted the ash leaf spirea ('Sem') over 10 years ago, so I don't think it has any surprises left for me. It does send out runners often but pretty easy to remove them. It is a tough shrub, which I needed to survive in this tough location. It's next to a purple smoke bush and the color combo is nice.
