This year around the end of August--about Labor Day my wife, Carol, went around and collected about 100 or more real small ones that came up late, stuffed them in hanging pots and hung them in the green house. They turned out just absolutely gorgous and just peaked about a week ago (in the green house). I think Moss Rose and Hens and Chicks are her favorite little plants. Edit added: One wouldn't normally think of Hens and Chicks as a filler or ground cover plant usually, but Carol uses those very effectively in many places in her gardens.