This enigmatic species from Mindanao produces some of the largest pitchers in the genus! It grows best in intermediate and highland conditions with high humidity. The plants listed for sale come from Borneo Exotics, BE-3517. This species was recently described and once was designated as “black truncata”. There's some controversy over the split between robcantleyi and related taxa; however, the current scientific consensus is that Nepenthes robcantleyi is synonymous with nebularum and therefore the preceding distinction of robcantleyi should be used for all plants.