I think they prefer acid soil adjust the PH sounds like a way to go and of course all the advice above... in my zone they self seed and there is a cold snowy season wet acid rain spring and drought in summer July thru oct. they are the perfect self care plant in my whole garden and deer don't eat them nor gophers. Plus zero pests! Who could ask for anything more.?
You always have beautiful beautiful pics of your garden... love you pics and advice.
