I live in Bristol and during the last 2 winters I have had an aeonium schwarzkopf plant which has died, despite bringing it indoors. The first time the pot was placed on a floor with underfloor heating next to some bi-fold doors, and I assumed that was the problem. So last winter I put it in the hallway near the front door, but the leaves still turned green and dropped off, eventually dying. I have bought another one and was thinking of overwintering it in a cold frame outside. Can anyone offer advice in terms of where to keep it and how much water it should be given during the winter months?