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My aunt had Dusty Miller in her garden bed, and I always liked the look of it. She said she had them for many years without replanting new ones (except for the occasional one that died). All she did was trim them back in late fall. We both used to be zone 6b but are now in 7a.
A few years ago I decided to plant some Dusty Miller in some large planters, along with some hosta and dianthus (the annual dianthus). When I bought the Dusty Miller, it was labeled as an annual, but it's now in it's third season! I never cut them down like my aunt did, and they have grown very tall and leggy. But there is a lot of new growth at the base of the stem.
So, is it really an annual and just hardy? Or is it a perennial in these zones?