Houseplant care is the act of growing houseplants and ensuring they have the necessary conditions for survival and continuing growth. This includes providing soil with sufficient nutrients, correct lighting conditions, air circulation and adding the right amount of water. Watering houseplants on a regular basis is necessary for the plant to remain healthy and thrive. They should not, however, be watered on a scheduled basis, because different plant species need different amounts of water and sunlight so it is important to know the specifics for the particular plants that are being grown. Houseplants sometimes also need to be cleaned of dust and greasy films that collect on the leaves when they are indoors. Dusty, grimy leaves can inhibit growth.