Place the pots on the pebbles, being certain that the bottoms are not sitting in the water. Plants will furnish their own humidity when many are placed close together. Interior plants under active growing conditions should be fertilized every two to three months. During winter months, or under conditions of low light, the frequency of fertilization should be reduced. Many problems associated with growing plants indoors are erroneously attributed of insufficient fertilizer.
Poor growth is usually due to some other factor, such as insufficient light.
Plants do not like locations which expose them to cold or hot air. They also suffer from gas fumes and products of incomplete combustion, which makes fresh air essential during winter. Plants grown in the home collect dust just as furniture and will require periodic cleaning and grooming. Clean plant foliage by washing with warm water. Some plant leaves are difficult to clean and may require the addition of a drop or two of detergent to the cleaning water.