Start by trying to locate them in a room such as the kitchen, bathroom or laundry room, where more water is used, if they show symptoms of low humidity, such as brown leaf tips. Placing plants on a tray of pebbles and filled with water will increase humidity around the plant as the water evaporates. Another option is to cluster the pots together and place a dish of water in the center of the pots. Most houseplants, however, will perform just fine without these extra efforts to increase humidity.
