Carnivory
The prey of N. insignis appears to consist almost solely of big-winged cockroaches. It has been suggested that these nocturnal insects are attracted by odour produced by the plant.
Nepenthes insignis has been used in a study concerning the carnivory of Nepenthes and their production of the allelochemical plumbagin. It was shown that L-alanine fed in vitro to the pitchers of N. insignis is used to build up plumbagin, but is not incorporated into rossoliside and plumbaside A. The results suggest that these compounds are used for storage and have very low turnover rates.
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