In winter for VFTs, I drain off excess water from the pots, hit them with a sulphur based fungicide and place in zip lock bags and pop them in the fridge for 3-4 months. Late winter around March I take them out hit them with sulphur based fungicide again and place in a south and west window until night time temps. Regularly stay above freezing then slowly acclimate them to full outdoor Sun.
They are not houseplants. Some people grow them indoors but they don't last long indoors. They need 8+ hours of direct Sun a day and indoor Sun isn't as strong as outdoor. AND they need 3-4 months of winter dormancy.
