Addressing Cold Damage in Nepenthes ampullaria and bicalcarata

A grower's N. ampullaria and N. bicalcarata developed brown, dry leaf tips after night temperatures dropped into the low 50s°F. Other highland species were unaffected.

Diagnosis

Both species are true lowlanders requiring night temperatures above 65–70°F. Cool nights cause metabolic stress, visible as tip burn on the newest growth.

Solutions

• Create a mini greenhouse or heated enclosure just for these two species.
• Use a small electric heater to maintain 70°F+ nights.
• Rust-colored spots on leaves are often a benign fungal reaction; treat with fungicide only if active mold is visible.

Without consistent warmth, these species will slowly decline.