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I think it comes into the category of "be careful what you wish for" plants. Like oriental poppies and forgetmenots.
Still, I suppose if you have a spot where nothing else will grow, Bill Wallis is the man to fill it.
Btw, are you from north America or do you really grow it in a yard? It would be tough enough I suppose.
Sorry for the Americanism, Didn't mean to say that really because it is growing in my lawn. Watching too much US tv.