People here grow them outside all year long. But those I know live near the coast where the sea prevents too low temps. I live aprox. 80 kms (50 mile) from the sea so I have occasional outside temps bellow 0ºC (32 F). Inside, in a south window, I can get 14ºC (58 F) at night and 22ºC (72 F) on a sunny day. As a reference I grow easily phals and my catt in this room.