84-91 days. Cirrus Dusty Miller seeds grow a vigorous Mediterranean favorite ideal for many moderate to dry gardens across the country. Pelleted seeds. Cirrus seeds boast one of the most tolerant, resilient, yet decorative perennials with their tidy 8-10" silvery leaves widely considered the most silver of all Dusty Miller varieties. Cirrus Dusty Miller is just as popular to show off outdoors as it is to keep indoors in a favorite decorative container. Cirrus Dusty Miller is easy to grow from seed and guarantees a unique and stunning ground cover for many residential and commercial spaces. Pelleted Seeds.