Revitalizing a Declining Nepenthes sanguinea

Matt has grown N. sanguinea for 1.5 years in a north-facing window (4 hours direct morning sun, 1 hour evening) in long-fiber sphagnum kept moist with rainwater. Recently, pitchers shrank from 8" to 6", leaves yellowed with orange edges, and three basal shoots appeared. He wondered if the basal shoots were draining the plant or if light was excessive.

Basal shoots

Nepenthes sanguinea

Jeff Dallas reassured him that 4 hours of direct sun through glass is fine—N. sanguinea likes bright conditions. Glass blocks ~80% of UV, so direct sun through a window is necessary. Newer 100% UV-blocking windows can prevent pitchering entirely.

Yellowing may indicate heat stress rather than light intensity—try moving the plant back slightly if the window gets very hot. The more likely culprit: old soil. Pure long-fiber sphagnum breaks down over time, leading to poor aeration and potential root rot. Repot into a mix of sphagnum, orchid bark, and perlite for better drainage. Nepenthes like moist but never waterlogged soil.

Good Growing!

Jeff Dallas
Sarracenia Northwest
https://www.cobraplant.com