Of the few unrelated species of dusty miller, the most common here is Senecio cineraria. Like other dusty miller species, its foliage is remarkably silvery white. Its foliar tomentum can be so thick that it resembles fine felt. Individual leaves exhibit intricately deep lobes. They are about two to five inches long, but are smaller and simpler on upper floral stems.
Dusty miller blooms with floppy clusters of tiny but bright yellow daisy flowers. However, because the colorful foliage is more appealing, bloom might not be a priority. Removal of floral stems prior to bloom promotes denser and neater foliar texture. Within more severe climates, dusty miller is a warm season annual. It is a resilient shrubby perennial locally.
Mature specimens of dusty miller can get a bit taller than three feet with bloom. They are shorter with grooming and pruning to maintain compact form without bloom. If necessary, they are conducive to pruning to limit their height to about a foot and a half. This species tolerates a bit more partial shade than other dusty miller. Ideally, it prefers sunny warmth.
Tony Tomeo 
Once in a while, my dusty miller comes back the following season. It happens often enough that I don’t pull it out in the fall when I do the other annuals. (I’m Zone 5, though the recent re-zoning now puts me in 6.) We had a pretty mild winter here this year, so I’m seeing a lot of new growth on last year’s plants. It rarely blooms here. I particularly like them next to blue flowers, such as ageratum.
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Mine have been in their planter box for several years. Frost is minimal. They contrast splendidly with the darkly bronzed foliage of ‘Australia’ Canna. I am not often there to trim off the flowers, so I just let them bloom, and deadhead them later. The foliage is still pretty, even if not compact without bloom.
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