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1. Cut off all dead leaves. With any of Sweet Pitchers (Sarracenia rubra), trim all leaves right down to rhizome. This will help reduce moisture loss. There is no need to do this other species.
2. Give plant a good spraying with a sulfur-based fungicide. (We use Safer brand.) Follow instructions as directed by manufacturer.
3. Place your plant in an unheated shelter, and keep soil moist at all times.
This is perhaps simplest method of protecting your plant from dry freezing Arctic wind. Just remember that it is not frost that destroys outdoor container plants. It is dry freezing wind.
In April, it will be safe to bring your plants out of dormancy, which happes to be about same time black bears come back out and begin foraging.
If you live in zones 6 and above, wind protection is necessary when there is a brief cold snap, bringing temperature down below 20°F. In this case, wind protection is usually temporary and covering your plants with a tarp or sheets of plastic will do trick.
Jacob Farin is co-owner of Sarracenia Northwest, a nursery specializing in the cultivation of carnivorous plants. More information about the cultivation of carnivorous plants can be found at http://www.cobraplant.com.