very tender indeed as not hardy below 10 deg c It looks as though it wont stand wet either. if its in a pot then indoors in a bright spot, keep above 10 c but don;t subjecy it to full blast central heating, if its in the garden then cover with frost fleece or anything organic like dry leaves. Most Uk advice seems to be to grow it as an annual and not expect to keep it over winter though. Good Luck!