I was hoping it would reseed here alas nothing doing,..i got two cuttings some 10 years ago and grew the two to the stage you see them at,..problem is they are getting taller with the blooms at the top and a thick base of about three foot with just the bare base,..so i will need to fill that gap this year,..as you mentioned they are invasive in the USA but mine didn't spread
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Philip
