Nepenthes REINWARDTIANA

Nepenthes REINWARDTIANA - Reinwardt's pitcher plant, Nepenthes reinwardtiana.

Nepenthes (pitcher plant) is a genus of carnivorous insectivorous plants, being the sole representative of the Nepenthaceae family and comprising about 120 species. These unusual plants grow mainly in the tropical rainforests of Asia, Madagascar, Seychelles, New Guinea, and northern Australia.

In most cases, pitcher plants are lianas leading an epiphytic lifestyle on tree crowns. At the same time, they do not parasitize the host tree, but only use it as a support. The leaves of Nepenthes have an unusual structure: the lower part of the leaf is broad and photosynthetic, the middle part is transformed into a tendril twining around tree branches, and the upper part is modified into a pitcher-trap.

In cultivation, Nepenthes can only be grown for a short time unless both warmth and high air humidity are simultaneously provided. It is not worth acquiring the plant without a greenhouse or a tropical floral display case. Nepenthes looks most impressive in hanging arrangements or wooden baskets, from which its pitchers can hang down freely.

Reinwardt's pitcher plant has a creeping stem up to 10 m (32.8 ft) long, not more than 0.6 cm (0.2 in) in diameter, triangular in cross-section, with internodes up to 10 cm (3.9 in). The leaves are leathery, sessile, linear-lanceolate, up to 15 x 4 cm (5.9 x 1.6 in), gradually tapering toward the base, pointed at the apex, with up to 4 longitudinal veins on each side of the central one, and a tendril up to 20 cm (7.9 in) long.

Lower pitchers taper toward the middle and widen again at the throat, measuring up to 15 x 5 cm (5.9 x 2.0 in). The peristome of the pitcher is oblique, nearly circular. The lid is rounded-oval, without appendages. Upper pitchers are swollen at the base, then become cylindrical and widen again at the throat, measuring 20 x 5 cm (7.9 x 2.0 in).

Female inflorescences are usually shorter than male ones, with a peduncle up to 10 cm (3.9 in) long. A characteristic diagnostic feature of the species is the presence of 2 translucent "eye-spots" visible on both inner sides of the back of the pitcher throat.

The seed method requires a time commitment. Moss is placed in a container, moistened by spraying with distilled water, and seeds are placed on top using tweezers, covered with film or a piece of glass, and germinated in light, but not in direct sun at a temperature of 23-25 °C (73-77 °F). It is necessary to avoid drying out of the sowings; air humidity should be maintained at an 80% level.

Seeds germinate within a month. As soon as the seedlings grow and 3-4 leaves appear on them, the plants can be transplanted into individual pots.

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Nepenthes is finicky, but growing it under room or greenhouse conditions is possible by observing several conditions. This heat-loving exotic plant does not tolerate drafts and handles temperature fluctuations poorly. The vine needs ample space and good lighting without direct sun rays, which can scorch the leaves.

From spring to summer, when the pitcher plant grows actively, it needs frequent watering, elevated humidity, and a constant air temperature not below 22 °C (72 °F). In winter, the "dormant" vine feels well at 16-18 °C (61-64 °F); this slight temperature reduction positively affects the formation of pitchers. Loose soil must constantly remain moist; immersing the pot with the plant in water is recommended. Only soft water should be used for watering. The optimal humidity level is 80%.

From March to September, every 2 weeks the plant requires mineral and organic fertilizers. Formulations for orchids diluted three times more than indicated in the instructions are suitable as feedings. The vine requires a support along which it will reach upward.

Propagation by apical cuttings is effective only in a greenhouse at a temperature not lower than 25 °C (77 °F) and high air humidity.