The second one looks like the weed purslane to me. However there is an ornamental purslane that is lovely. See http://plantsdatabase.com/go/242/ So if you planted this it is probably the ornamental. If it is the weed, get rid of it, it seeds like crazy. The third is sedum, can't really tell which one until it blooms. By the way I am in zone 5 and the purslane is an annual here.