I'm surprised that no one has mentioned this one. It has staying power, beautiful pink to slightly purple large flowers, and every part of the plant seems to be intensely furry, including the wonderful pods. My picture of the pods is unfortunately a slide but am showing a photo of it in bloom. It has never seeded itself here and does not make viable seed pods every year. I tried sowing the seeds in the garden and got nothing, but pot culture results in seedlings. It seems to like lime, sun and wind and grows here in screes, crevice garden, and sand bed. In the last it doesn't seem to last more than 4 years or so. The buns start to silver in April if the snow has gone and it will bloom the end of April to early May, the blooms lasting a couple of weeks.