Another technique for increasing humidity is to place watertight saucers or trays holding an inch or two of wet pebbles under the plant containers. Add water to the saucer or tray to a point just below the surface of the pebble layer. Humidity increases around the plant as this water evaporates. Make sure the water level in the saucer never rises to the bottom of the pot. If this happens, the salts will accumulate at the soil surface, and roots will be damaged.
Air conditioners tend to make indoor air drier during the summer cooling season.
Cool mist vaporizers or room humidifiers provide an effective means of adding moisture to the air. In a home environment sensitive plants can be grown in more naturally humid rooms such as the kitchen, bathroom or laundry room. The above information is in cooperation with the North Carolina Cooperative Extension Service.