Nepenthes aristolochioides inhabits Sphagnum-dominated mossy forest near the tops of steep ridges. It usually grows terrestrially, but can also occur as an epiphyte in pockets of moss on tree trunks. The species occurs sympatrically with N. gymnamphora and N. singalana. It grows with the former in montane forest and swamps dominated by Pandanus species that line the shoreline of a crater lake. The altitudinal distribution of N. gymnamphora on Mount Tujuh (1800-2100 m) overlaps that of N. aristolochioides, but no natural hybrids have been observed. A small form of N. singalana occurs in the same habitat as N. aristolochioides, but appears to occupy a different ecological niche; it is generally confined to the forest floor while N. aristolochioides often climbs into the canopy. A number of plants representing the natural hybrid N. aristolochioides × N. singalana have been recorded.