While observing the comparative growth pattern of some tree species under controlled conditions of a University campus it was clearly established that Cordia dichotoma , Cassia fistula , Albizzia are not suitable for calcareous soils with "hard water " Their observed growth under controlled conditions was very poor over a period of 30 years. However under extremes of arid conditions Prosopis cineraria ( Khejri of Rajasthan) was thriving better and it formed very good formation with Neem (Azadirchta indica) as neem provided pesticides and Khejri provided nitrogen fixation. No wonder Khejri is worshipped in Rajasthan .One has to witness this observation to see the rapid growth of Prosopis cineraria at the Banasthali University campus at Niwai Jaipur. Professor Vinay Sharma Head of the Department of Biotechnology at that University may throw some more light on this process. However I am thankful to the management of that University for following my advice which I gave almost 30 years ago. Khejri is most suitable plant for deserts but for its initial slow growth. It remains to be determined how one can improve the growth of Khejri to make if more attractive for farmers. It remains to be determined how one can improve the growth of Khejri to make if more attractive for farmers.