Tropical and mountain carnivorous plants are picky about heat, and new growers often worry most about humidity. Pick your plant, enter the warmest daytime and coolest night temperature where it grows, and add the humidity if you know it. The checker compares your conditions with the ranges published by Clemson Extension, NC State Extension, the nursery Sarracenia Northwest and the International Carnivorous Plant Society (ICPS).
Where the Ranges Come From
| Plant | Temperature | Humidity | Source |
|---|---|---|---|
| Nepenthes, common hybrids | Days about 68 to 88 °F (20 to 31 °C), nights about 50 to 65 °F (10 to 18 °C) | No specific percentage; adapts to household air | Sarracenia Northwest |
| Nepenthes, highland species | Days 70 to 80 °F (Clemson) or 75 to 85 °F (NC State); nights 50 to 60 °F (Clemson) or the low 60s °F (NC State) | Above 60% | Clemson Extension, NC State Extension |
| Nepenthes, lowland species | 70 to 95 °F (21 to 35 °C) | Above 60% | Clemson Extension, NC State Extension |
| Heliamphora | Tolerates up to 86 °F (30 °C); large plants can die with prolonged heat above 79 °F (26 °C); above 104 °F (40 °C) is fatal for most species; survives light frost | Enclosure needed indoors unless the room is above 70% | ICPS |
| Cephalotus | Hot days up to 100 °F (38 °C) are tolerated if nights drop below 70 °F (21 °C); brief light frost while dormant | No terrarium needed | Sarracenia Northwest |
| Mexican butterworts | Mild; avoid prolonged heat, especially sun through glass | Normal household humidity | Sarracenia Northwest, ICPS |
| Darlingtonia | Soil below 80 °F (27 °C) | Not a major issue if the roots are cool | ICPS |
Why the Sources Disagree on Humidity
Clemson Extension recommends humidity above 60% for Nepenthes. Sarracenia Northwest says the commonly sold species and hybrids need no specific humidity percentage and acclimate to normal household air, while some specialty Nepenthes need carefully controlled humidity and temperature. It explains that relative humidity naturally rises at night as air cools and falls during the day as it warms: at its Oregon nursery, summer days in the upper 80s °F can drop to about 25 to 35% humidity, and nights in the upper 50s °F rise to 65 to 85%. The checker shows both views for Nepenthes so you can judge your own plant.
For highland Nepenthes the two extension services also give slightly different numbers, so the checker uses the combined range and names both sources. Many commercial hybrids, Clemson Extension notes, are more tolerant of temperature than the species.
Related Guides
- Nepenthes temperature: highland vs lowland
- Nepenthes humidity indoors
- Butterwort care
- Why is my butterwort dying?
- Light checker
Sources
- Clemson Cooperative Extension, Home and Garden Information Center, Tropical pitcher plants (Nepenthes spp.), Jackie Jordan [hgic.clemson.edu/factsheet/tropical-pitcher-plants-nepenthes-spp-indoor-care-growing-tips-plant-guide]
- NC State Extension Gardener Plant Toolbox, Nepenthes [plants.ces.ncsu.edu/plants/nepenthes]
- Sarracenia Northwest, Q/A #160: Do Nepenthes need high humidity? [growcarnivorousplants.com/growers-q-a/qa-160-do-nepenthes-need-high-humidity-the-humidity-myth-part-1]
- Sarracenia Northwest, How to grow Cephalotus [growcarnivorousplants.com/cephalotus-follicularis-care]
- Sarracenia Northwest, How to grow tropical butterworts [growcarnivorousplants.com/tropical-butterwort-care]
- International Carnivorous Plant Society, Heliamphora growing guide [carnivorousplants.org/grow/guides/Heliamphora]
- International Carnivorous Plant Society, Darlingtonia growing guide [carnivorousplants.org/grow/guides/Darlingtonia]
- International Carnivorous Plant Society, Mexican Pinguicula growing guide [carnivorousplants.org/grow/guides/MexicanPinguicula]
This tool is editorially reviewed and its limits are checked against the cited sources. Last reviewed: October 2026.