Nepenthes rajah is comparable to that experienced in nature, since Borneo lies on the equator. Pure long-fibre "Sphagnum" moss is an excellent potting medium, though combinations involving any of the following – peat, perlite, vermiculite, sand, lava rock, pumice, "Osmunda" fibre, orchid bark and horticultural charcoal – may be used with equal success. The potting medium should be well-drained and not too compacted. Moss is useful for moisture retention near the roots. The mix should be thoroughly soaked in water prior to potting the plant. It has been noted that "N. rajah" produces a very extensive root system (for a "Nepenthes") and,
Spanish moss of filamentous volcanic glass. Spanish-moss has been used for various purposes, including building insulation, mulch, packing material, mattress stuffing, and fiber. In the early 1900s it was used commercially in the padding of car seats. In 1939 over 10,000 tons of processed Spanish-moss was produced. It is still collected today in smaller quantities for use in arts and crafts, or for beddings for flower gardens, and as an ingredient in the traditional wall covering material bousillage. In some parts of Latin America and Louisiana Spanish moss is used in Nativity scenes. In the desert regions of the southwestern United States,