What temperature lows can this species take? My two most vigorous plants are rapidly outgrowing my heated terrarium. Would an unheated room temperature terrarium or sunny windowsill work at this time of year? I'd expect lows of around 10 deg, which I presume is substantially lower than they'd experience naturally. The plants, which are currently around 15cm high, look very nice indeed, one is coming into flower, and I really do not want to lose them.