Plantlets were transferred to pots where they grew well, attained maturity and set viable seeds (Fig 8). The regenerated plants were successfully established in the field. About 200 plants were tested for the survival rate in different season. The survival rate during summer was 55–60% whereas in winter it was 100%. High temperatures (36–45°C) could be unfavorable for the establishment of plantlets in the field whereas low temperatures (25–28°C) during winter could be favorable for establishment. The study therefore suggests that for P. corylifolia hardened plants should be transferred to field only during winter season for the best survival rate [15]. Organized development leading to plantlet regeneration via embryogenesis has successfully been achieved in many plant species through judicious selection of the inoculum, proper choice of the medium, including the growth-active substances, and the control of the physical environment [16-20].