Portulaca or Moss Rose is a hardy perennial. Last summer I planted this in a pot that sat on the deck. It has succulent foliage and can tolerate dry weather or periods when I forget to water. Then it dies back when winter comes and looks very dead. We had some very cold weather last winter, down to -14 F and anything in an unprotected flower post should have been winter killed. But with the return of warm weather it reappears and is blooming again The lovely fragile looking flowers open and bloom for only a day or so then wither and dry up. But there are so many blooms that it is always attractive.. This is my kind of flower!