Pradeep Krishen is a nature-lover and in his book Trees of Delhi: A Field Guide, he has made a list of more than 250 species of trees found in Delhi. This book is not only for botanists, because of its simple language can be understood by anyone who is fond of trees.

The book gives specific details about each tree like its leaves, flowers and fruits and also tells you the places in Delhi where you can find those trees. There are picture illustrations in the book too, which help you in identifying each tree.

This book covers historical details about the different species of trees, how they have evolved and how the vegetation of the different areas of Delhi have changed over the years.