Artificial plants - UV treated
Artificial plants are not originally designed to be outside in extreme weather. However, most plastic based plants will last longer than the fabric plants as the leaves of many of these do tend to fade in time. Products such as boxwood balls and hedges we have found do last well when on balconies etc. They will fade a little eventually depending on how much sun they are in. Obviously some cover is preferable. We do have a UV spray which can be applied to the leaves to extend the life time. It is preferred they are kept out of the rain or the spray be re-applied at intervals as it will wash off in time.