Nepenthes glabrata Leaf Discoloration Resolved by Cooler Nights

A grower’s N. glabrata showed blotchy yellow/brown leaves. Suspecting high night temps (75°F), lowered to 55°F; new growth is bright green. Day 85°F, 12-hr 6500K light, sphagnum/perlite, DI water. Also used Trichoderma and ¼-strength orchid fertilizer.

Confirmed: Warm Nights Cause Metabolic Exhaustion

N. glabrata is a true highlander needing 15–20°F night drop, preferably below 60°F. Warm nights prevent metabolic recovery; cells die, causing discoloration. Correction is working. Stop Trichoderma—Nepenthes aren’t prone to root fungi if top-watered and drained well.