Floral designer Emily Thompson has a very different vocabulary from many florists: she creates thickets, heaps, vapors, gusts and gales, using birds, beasts, branches, trees and flora. Her creations for runway fashion shows, gala events and the White House evoke meadows, forests and fields. Fifteen years after her disruptive arrival on the floral scene, she has published a book documenting her work. Martha and Emily talk about their floral obsessions and creating unforgettable work in the most ephemeral of arts.