Digestive enzymes excreted by the plants then allow them to digest their insect prey, which is rich in nitrates. You can grow some carnivorous plants in a terrarium on a bright windowsill. The best candidates are pitcher plants, sundews and Venus flytraps. Keep the soil very moist, but not waterlogged, and water with distilled water chlorine in tap water is toxic to most carnivorous plants. Though high humidity is necessary, so is air circulation, so keep the lid to the terrarium cracked a bit.
Plants are available at some nurseries as novelties, or through mail order sources.
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