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It's listed in the RHS Pant Finderhttp://apps.rhs.org.uk/rhsplantfinder/pfregions.asp?ID=138612
I think it's a perfectly reasonable question. After all, even if prone to be invasive with some it may not be with you and it sounds to me ( from your three acres to share with the bluebells, that you could take a little risk..... after all, a campanula called after a vegetable has to be fun, doesn't it? I'd plant it.