Dusty Miller (Jacobaea maritima, a.k.a. Senecio cineraria) is a marginally hardy, herbaceous perennial. It’s hardy here, anyway. We have it growing in an urn-shaped container near the end of our driveway and it seems happy enough. It does have flowers but they are not particularly ornamental and many people prune them off so as not to distract from the foliage, which is what the plant is generally grown for. It does well in both shade and sun and really takes very little care.