To improve the yield of the fruit, the Litchi Research Centre in Bihar's Muzaffarpur has introduced a new method. Calling it 'buniyad purani, nayi kahani', the method involves rejuvenating old litchi trees. According to the director of the centre, scientific pruning by this method ensures that trees bear fruit in three to four years as opposed to planting new trees that will take 9 to 10 years to bear fruits. The centre has urged farmers to use this method and reach out for assistance. Muzaffarpur is famous for the Shahi Litchis and is popularly known as the 'Litchi Kingdom'.