Ghai said he was never much interested in studies and was always attracted to the world of acting and music.
"I was always interested in acting and music. I was not interested in studies during my school days. However, I never failed in my exams. The reason for this being, one month prior to exams I used to go and sit under trees in the villages and study," he said.
"The inspiration and energy I got from this kind of exercise was enormous and I cleared all my exams in this way," he said.
Ghai said he continued to draw inspiration even later in his life and that he got lot of film ideas while sitting alone in the greenery at Lonavla and Igatpuri.
"Many of my famous movies emerged from the loneliness when I worked under trees giving serious thoughts at Lonavla and Igatpuri. Therefore, you should all plant maximum trees to preserve and protect the nature and environment," he said
The filmmaker was speaking as a chief guest at the launch of a government's sapling plantation drive at Mharal in Kalyan town.
Ghai said in Mumbai's Film City, there were around 1,000 trees, some of which were planted by famous yesteryear actors.
Trees play a vital role in the life of people, Ghai said, adding that everyone should plant trees and help in their upkeep.
Plantation should be a continuous process and promised all help to the cause and to save the environment and the earth, he added.
Maharashtra Chief Minister Devendra Fadnavis, forest minister Sudhir Mungantiwar, Thane Guardian Minister Eknath Shinde, Isha Foundation's spiritual leader Sadhguru Jaggi Vasudev and Patanjali Ayurved MD Acharya Balkrishna were also present at the event.
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