Your N. truncata's behavior—one active pitcher at a time, new pitchers causing old ones to brown from the hood—is completely normal! This species doesn't produce pitchers prolifically like N. sanguinea. Our 10-year-old greenhouse specimens (2.5-foot leaf span) rarely exceed two simultaneous pitchers, even in summer.
Boost growth by feeding insects (not fertilizer) when pitchers are active. Many giant Nepenthes (N. rajah, N. merrilliana) show similar single-pitcher patterns.
Jeff Dallas, Sarracenia Northwest
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