Growing your Ficus Bonsai Ficus bonsai are ideally suited for indoor bonsai. Watering Ficus bonsai, as with most bonsai, like to dry out between waterings. Light Ficus bonsai grow well in either direct or indirect sunlight. We prefer to grow Ficus in shady areas. Feeding Fertilize your Ficus bonsai once every two weeks during the growing season, spring until fall.We recommend using an organic liquid fertilizer such as a fish emulsion or an organic seaweed fertilizer.