Cultivation
Nepenthes may be cultivated in greenhouses. Easier species include N. alata, N. ventricosa, N. khasiana, and N. sanguinea. These four species are highlanders (N. alata has both lowland and highland forms), some easy lowlander species are N. rafflesiana, N. bicalcarata, N. mirabilis, and N. hirsuta.
Highland forms are those species that grow in habitats generally higher in elevation, and thus exposed to cooler evening temperatures. Lowland forms are those species growing nearer to sea level. Both forms respond best to rainwater (but tap water works as long as it is flushed with rainwater or soft water monthly), bright light (not full sun), a well-drained medium, good air circulation and relatively high humidity, although easier species such as N. alata can adapt to lower humidity environments. Highland species must have night-time cooling to thrive in the long term. Chemical fertilisers are best used at low strength. Occasional feeding with frozen (thawed before use) crickets may be beneficial. Terrarium culture of smaller plants, such as N. bellii, N. × trichocarpa and N. ampullaria, is possible, but most plants will get too large over time.
Plants can be propagated by seed, cuttings, and tissue culture. Seeds are usually sown on damp chopped Sphagnum moss, or on sterile plant tissue culture media once they have been properly disinfected. The seeds generally become nonviable soon after harvesting, so seed are not usually the preferred method of propagation. A 1:1 mixture of orchid medium with moss or perlite has been used for germination and culture. Seed may take two months to germinate, and two years or more to yield mature plants. Cuttings may be rooted in damp Sphagnum moss in a plastic bag or tank with high humidity and moderate light. They can begin to root in one to two months and start to form pitchers in about six months. Tissue culture is now used commercially and helps reduce collection of wild plants, as well as making many rare species available to hobbyists at reasonable prices. Nepenthes species are considered threatened or endangered plants and are listed in CITES appendices 1 and 2.
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