In “How Flowers Made Our World,” David George Haskell makes a case for their soft power. By Adam Nicolson Adam Nicolson is the author, most recently, of “Bird School: A Beginner in the Wood.” When you ...

Let’s get one thing clear right off the bat: I am not a green-fingered person. On the contrary, I am startlingly capable of killing even the most resilient plants, to the point that I once mismanaged ...