When Flower Power indicates that it is time to fertilize your plant, follow the instructions provided by the fertilizer manufacturer. In most cases, indoor and outdoor plants require different amounts of fertilizer due to their rate-of-growth. Also, plants that are in pots usually require less fertilizer than those directly planted in soil. If you are using liquid fertilizer, thoroughly saturate the soil with the fertilizer and water mixture. If you are using solid (pellet) or other fertilizer products that are applied on the surface of the soil, water thoroughly after application.