The short answer
Most tropical houseplants are happiest around 50 to 60 percent humidity. Group them and run a cool-mist humidifier nearby, measuring with a hygrometer so the rest of the room stays below about 55 percent.
How much plants need
| Plants | Comfortable range |
|---|---|
| Cacti and succulents | Dry air is fine (30-40%) |
| Pothos, snake plant, ZZ | Tolerant (35-50%) |
| Calathea, ferns, fiddle-leaf fig, orchids | Humid (50-60%+) |
Setup
- Group humidity-loving plants together; their leaves raise local humidity.
- Run a cool-mist humidifier a few feet away, not aimed directly at leaves.
- Use distilled water in ultrasonic units to avoid mineral spots on leaves.
- Keep good airflow to prevent fungal problems.
Products mentioned
Questions readers ask
Do pebble trays work?
They raise humidity only slightly right above the tray; a humidifier does much more.
Is misting plants enough?
Misting raises humidity for minutes; a humidifier holds it.