The orange plants used for bonsai are called calamondin oranges. These oranges are similar to kumquats in their care requirements. Traditionally sized orange plants cannot survive in the small pots needed for bonsai plantings. Bonsai orange plants are one of the few bonsai plants that will survive indoors. Knowledge of how to care for this plant will help you produce an attractive addition to your home.
Purchase an orange bonsai from a reputable grower in early spring. Make sure that the company ships it directly to you as it will have a better hope of survival. Ideally, pick up the bonsai orange directly from the company.
Place the bonsai orange in full sun outdoors. This plant does better if it resides outside from March to October (or as long as temperatures stay above 44 degrees Fahrenheit). If you decide to keep it indoors, place it in a well-ventilated, sunny area between 55 and 75 degrees Fahrenheit.
Water the bonsai orange during the growing season. Allow the top of the dirt to dry slightly between waterings. Decrease watering in the winter, keeping the soil just moist enough so that it does not dry out completely.
Fertilize the bonsai orange right after flowering with a complete all-purpose fertilizer diluted by half. This will encourage proper growth and fruit production.
Re-pot the bonsai orange every two or three years into a slightly larger pot. This will keep the roots from becoming matted.