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Is it invasive in your garden Lincslass? It is in mine..

It does seed everywhere, usually not where you want it to be, but it is so very attractive. I try to remember to cut off the flowers!

Not at all which is strange, i`ve had it for years and it rarely gets any bigger even...

love this - ours is big - and I love it

Mine self-seeds everywhere, but i love it....You need to remove the flowers just when they begin to turn brown...