How should I adjust humidity seasonally?
Written by
Paul Reynolds
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Seasonally adjusting humidity enhances plant health and reduces stress throughout the year. During winter, the air becomes dry and desert-like, while in summer, it becomes humid and hot. Both transitional seasons , spring and fall , require careful observation. I apply different tactics to my plant care every 3 months to provide the best care for my plants. Start observing seasonal patterns today.
Winter is the time to actively provide humidity. Most heating systems reduce humidity to levels of 20-30%. Set up humidifiers anywhere between 6 and 8 hours during the day near plant groupings. Avoid placing radiators or heat vents too close to plants, as this can cause direct heating, group tropical plants together for their mutual moisture requirements. For example, I can put pebble trays under my ferns in the winter.
During the summer months, it is crucial to reduce humidity while maintaining adequate airflow. Natural humidity can often exceed 50%. Moisture should never be completely removed to reduce mold. Fans should be positioned to circulate air for at least 8 hours every day. Do not blow air conditioning directly on your plants. Open windows in the morning to create fresh air turnover while it's cooler.
Winter Solutions
- Use humidifiers near plant groups
- Extend pebble tray maintenance
- Cluster humidity-loving plants
- Avoid direct heat sources
Summer Management
- Reduce misting frequency
- Increase fan circulation hours
- Position away from AC vents
- Monitor for mold weekly
Transition Seasons
- Gradually reduce humidifier use in spring
- Slowly increase airflow in fall
- Reposition plants for changing light
- Clean mineral deposits monthly
Geographical variations affect seasonal approaches. Coastal regions utilize their natural humidity; nonetheless, they tend to rinse off the salt spray on a monthly basis. Arid regions will use humidifiers year-round. Mountainous areas often feature terrariums to accommodate sensitive plants. I adjust based on interpreting the weather report for the day or my indoor hygrometer.
Shift slowly when transitioning seasons. In the spring, outdoor moisture levels increase, so it is recommended to reduce the use of humidifiers over the course of a few weeks. The fall produces winds that tend to dry out the environment, so it's a good time to start using pebble trays again. Clean the equipment during the seasonal switch to prevent mineral buildup. Incorporate new plants when the weather remains stable in the spring or fall, allowing them to acclimate more effectively to the environment.
Read the full article: 10 Essential Tips for Indoor Plant Humidity
