Most come from boggy habitats, so need damp or wet conditions and special low-nutrient compost. Some, including species of Sarracenia, Pinguicula and Drosera, are hardy and happy grown outdoors all year in a sunny spot, while others, like the cobra lily Darlingtonia californica, need to overwinter in frost free conditions. Those that come from tropical forests, like Nepenthes, need warm, humid, partly shady conditions and should be grown indoors all year round. They all prefer to be watered with rainwater and many like to sit in a saucer containing 2.5-5cm of water during the growing season. During the winter, they prefer the compost to be kept damp rather than wet.