The Monstera deliciosa, frequently called the Swiss Cheese Plant, is a popular houseplant prized for its dramatic, perforated foliage. Originating in tropical regions, this plant naturally thrives in environments with high ambient moisture. While its preference for humidity is clear, the common practice of misting its leaves with a spray bottle is largely ineffective for meeting this environmental need. Misting offers only a brief, temporary increase in moisture while introducing several potential health risks for the plant.
Why Misting Does Not Work
Misting fails as a long-term humidity solution because water evaporates rapidly in a typical indoor setting. The fine water droplets sprayed onto the leaves evaporate within minutes, especially in homes with heating, air conditioning, or standard airflow. This fleeting burst of moisture does not significantly alter the overall relative humidity of the surrounding air. For a lasting effect, the moisture source must be continuous.
Misting also introduces the risk of fostering bacterial and fungal diseases on the leaf surfaces. Water droplets that sit on the foliage create an ideal environment for pathogens to thrive, which can lead to problems like leaf spot. This is particularly true if the plant is placed in an area with low light or poor air circulation. Furthermore, using tap water can leave unsightly white mineral spots on the glossy leaves, interfering with the plant’s ability to absorb light efficiently.
Understanding Monstera’s Humidity Requirements
The Monstera originates as an epiphyte in the tropical rainforests of Central America. In its natural habitat, it grows attached to larger trees, constantly exposed to warm, moist air and frequent rainfall. These conditions maintain a high relative humidity, often between 70% and 90%.
For a healthy indoor environment, the Monstera deliciosa requires relative humidity consistently maintained above 50%, with an ideal range between 60% and 80%. When the air is too dry (below 40% RH), the plant shows visible signs of distress. Symptoms include the tips and edges of the leaves turning brown and crispy, known as “tipping.” Low humidity can also hinder the unfurling of new leaves, causing them to stick together and tear.
Better Ways to Increase Ambient Humidity
Use a Humidifier
The most effective method for providing consistent, sustained humidity is the use of a dedicated room humidifier. A cool-mist humidifier can reliably raise the relative humidity in the plant’s immediate area to the desired 60% or higher. This device offers a constant source of water vapor that genuinely changes the atmospheric conditions around the plant, unlike the momentary effect of misting.
Implement a Pebble Tray
Another reliable and low-maintenance method is the use of a pebble tray. Place the Monstera’s pot on a shallow tray filled with water and a layer of pebbles or gravel. The base of the pot must sit above the water level to prevent the soil from drawing up excess moisture and causing root rot. As the water in the tray evaporates, it creates a small, humid microclimate that directly benefits the foliage.
Group Houseplants
Grouping the Monstera with other houseplants can contribute to a communal rise in localized humidity. Plants naturally release water vapor into the air through transpiration, and clustering them together concentrates this moisture.
Choose a Humid Location
Placing the plant in a naturally humid space, such as a well-lit bathroom or kitchen, can help it access higher moisture levels from regular household activities.