I have several osteospernums in pots and some are planted in the garden. I just wanted to know if they are tender or not. A couple are planted in the borders and seem to survive from year to year but the ones in pots havnt been so lucky. I had a lovely white flower with variagated leaves that was in a large pot that I lost one winter. Should I move all the pots under cover or are they hardy? Apparently the temperature is going to drop down to freezing tonight. I am in Cornwall.