Houseplant watering – Do not water houseplants on a schedule such as every Saturday. Instead check them regularly by placing your finger into the soil up to the first knuckle. For most plants the soil should be just barely damp. Water needs of plants vary by temperature, sunlight, and how much the plant is growing so water needs may change throughout the year. Keep your houseplants away from blowing air from furnaces, air conditioners, or an outside door.