Your home humidity level is important for both yourself and your plants. Indoor plants need the air to be humid, so that their leaves do not dry out, particularly plants with thin leaves. Plants with thick leaves or a leaves with waxy coatings are more resilient to water loss, therefore they can survive much better than thin leaved plants in lower humidity levels. The ideal humidity level for plants is between 50 and 60 percent. You can increase the humidity level for plants by spraying warm water on their leaves. You can also increase the humidity level in room by using a humidifier. A cheaper option would be to place a bucket of water next to the fire or other humidity-draining device.