There are those purists who would object to a verbascum (even a dainty one like this) in a rock garden. There are those who regard all mulleins as noxious weeds. There are a lot of silly people in the world. Last year was the year of the Verbascum at my Quince St. Garden...I kinda overdid it. This year I edited the vast majority of seedlings when they were small. Instead of two or three hundred, we probably only have fitty or so here and there: nothing too radical.
I think the only plant that gets more commens in my garden than the mulleins is Anthriscus sylvetris 'Ravenswing'. Although, I confess, with the tall bearded iris are in bloom, or the peonies, people do gawk. And of course there's Glaucium, a whole different story!
As for mulleins, I really can't have enough kinds. And miniature hybrids or sports like this one are all the more beguiling.