[header] How to care for indoor plants [title] Keep potting soil moist, but not wet. [step] If your soil is either too dry or over watered, it can damage the plant's roots and prevent the plant from growing. In some cases under or over watering your plant can also kill it. 
Plants with lush, thick leaves require more water than plants with waxy or leathery leaves. There is no specific frequency that works for all indoor plants.