In the winter for zone 7 or colder, do the following when the weather is going to be below freezing for extended periods.
1) Spray the plants and soil surface thoroughly with a sulfur based fungicide.
2) You can bring them into a cold room - like a unheated garage, unheated basement or crawlspace. Or, cover them with 6" or more of a mulch - pine needles are porous and acidic, so work well.
3) Check occasionally to make sure mold is not getting started.
4) When the weather warms and will be consistently be above freezing, remove the mulch.
Both Sarracenia and flytraps are more cold hardy than most people believe. I have left mine outdoors unprotected when temperatures got temporarily down to -5 deg F for a few nights. The key was that there was no wind to desiccate the plants during the time the roots were frozen. This is not a recommended practice, it is best to protect the plants when the temperature is going to get down to around 20 deg F.
