It's extremely well researched and well written and what's more, Mrs Pavord is a very nice person. Deborah Moggach's novel Tulip Fever was also published in 2000, another example of authors randomly (?) working on similar subjects at the same time. I didn't finish this one, finding the non fiction story far more enthralling.
The ethics of the cut flower trade is a hot topic just at the moment and I plan on reading Amy Stewart's Flower Confidential as soon as I can afford to buy it.