Nepenthes argentii inhabits subalpine shrubbery "with a smooth wind-clipped canopy 30 cm tall on an
ultrabasic ridge". On
Mount Guiting-Guiting,
N. argentii is sympatric with
N. sibuyanensis at around 1,600 to 1,770 m. A taxon resembling
N. alata grows on Mount Guiting-Guiting at lower elevations of 800 to 1,000 m; it was described as
N. graciliflora by
Adolph Daniel Edward Elmer. Other plant species
endemic to the mountain include
Lobelia proctorii and
Rhododendron rousei.
Nepenthes argentii has no known
natural hybrids, although it may hybridise with
N. sibuyanensis. No forms or varieties have been described. ==References==