Since its formation, New York has created reservoir after reservoir upstate to quench the thirst of a city that never sleeps. Lucy Sante, a multi-award winning author and critic, has compiled this history in her new book, Nineteen Reservoirs: On Their Creation and the Promise of Water for New York City. 

Afterward, journey to Victoria's cool central highlands, home to the world's tallest flowering plant — the mountain ash tree.Jonathan walks the forests with Lachlan McBurney, an Australian National University scientist and co-author of Mountain Ash: Fire Logging and the Future of Victoria's Giant Forests.

Then, a journey westward to Annie Smithers' farm, where Jonathan explores her spring garden, complete with peonies, Cockatoo-proof shallots, and rows of hard herbs.

And finally, Colin Bisset looks for symbolism in the Green Man — an architectural motif of a man's face surrounded by leaves, sometimes spewing vegetation from his mouth.