I would definitely agree with @Fairygirl as I have them growing everywhere. I either keep them or pull them out depending where they are growing or move them somewhere more suitable. I suspect you must already have some mature plants in your garden.
Nice! I have lots now, I just planted a dozen from cuttings I took in spring too. These are right next to a patch of about 6 mature ones, I'll leave them there as they are behind a rose, so will look quite nice.
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I live in west central Scotland - not where that photo is...
These are right next to a patch of about 6 mature ones, I'll leave them there as they are behind a rose, so will look quite nice.