Most pitcher plants (Nepenthes, Heliamphora, Sarracenia) can not only tolerate, but do well with occasional fertilizer application directly into the media, provided that it is flushed out with distilled water between feedings to rinse out the mineral salt residue, and any excess. I prefer to use half strength fish emulsion about once a month during the active growing season, and rinse well with distilled water before they slow down during my cooler season when the Sarr's go dormant and the Nepenthes slow down; the Heli's just seem to keep growing in a growth chamber under lights all year. Over fertilization is very harmful to any plants, and the inorganic ones leave "inert" salts behind, which can accumulate after a few months to toxic levels. The organic fertilizers can encourage other biological agents, which can turn your media into some rotting compost, with harmful byproducts of anaerobic decomposition.
I also use these fertilizers to spray onto the leaves of Pinguicula during their active growth season, which generally causes them to produce flowers. Even some Drosera can benefit from a mild spray of organic fertilizer once a month during their active growth.
- Rich