Posted: 04/11/2016 at 07:59
I have lots of these in the gaarden. I'm in the south but on heavy rich clay. Some years I leave them in the soil and most survive, but some rot away. So most years I lift them, put them in pots of leaf mould or compost, and keep them frost free, cool and quite dry until they shoot in spring.
if yours are in pots already I would just bring them into a frostfree greenhouse and leave them alone.
I do think they are hungry plants. When I plant them out in spring I always add a good handful of food. So perhaps in spring you should give them some feed to encourage more flowers?