Sacilotto found "N. fusca" to be tolerant of a wide range of conditions; with the exception of plants not treated with fungicides, no test groups showed a survival rate of less than 75%. "Nepenthes fusca" was found to tolerate temperatures in the range of . A nighttime drop in temperature below was necessary for good growth; plants that were not exposed to such a drop grew poorly and produced fewer pitchers. The experiments suggested that "N. fusca" grows best when relative humidity is in the range of 65 to 90%.