Nepenthes inermis Blackening Leaves: Soil Breakdown and Root Rot

Achim (Germany, Oregon-like climate) has 2.5-year-old N. inermis with slow blackening from leaf tips toward stem (since last fall). Temps 8–35°C, bright/shaded summer, soft tap water, original soil mix. Other Nepenthes show minor similar issues.

N. inermis

Jeff Dallas: Soil breakdown causing slow root rot. Coarse peat breaks down over time, loses air spaces. Repot into long-fiber sphagnum + perlite + orchid bark (fast-draining, moisture-retentive). Most Nepenthes aren't picky if media has air spaces and isn't rich. Allow 2 months recovery; trim bad leaves. Check water TDS—if >50 ppm, flush with distilled/RO/rainwater periodically.

Good Growing!

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