Winter Care for Windowsill Nepenthes in Scotland

A grower in Scotland moved Nepenthes (alata, ventricosa, rafflesiana, ventrata) from an indoor greenhouse to a south-facing windowsill. They thrive in summer but asks about winter: will reduced sunlight kill them? Should they return to artificial light?

Advice

In the British Isles/Pacific Northwest, winter days are too short for pitcher production. Plants stay leafy but stop pitchering. If the greenhouse has better artificial lighting, move them there and maintain a long photoperiod to keep pitchers forming.