The Nagpur oranges blossom during the Monsoon season and are ready to be harvested from the month of December. The orange crop here grows twice a year. The fruit available from September to December. A medium, 2 1/2-inch orange offers lots of vitamins, minerals and fiber, all for a measly 60 calories.
Provide direct sunlight for at least several hours daily. Move the plants outdoors for a few hours daily in the spring, increasing the time outdoors until the tree can stay outdoors for the summer. Bring the tree indoors in the fall. Water the tree as needed to keep the soil moist but not wet. Allow the top inch of soil to dry out before watering. A mixture of 1 part each potting soil, organic compost, and perlite or vermiculite. Fertilize your calamondin orange with a citrus formula or a slow-release formula specifically for acid-loving plants during the growing season. Dilute the fertilizer to half the recommended strength during the winter months.