Guns, Germs, and Steel: The Fates of Human Societies
Jared Diamond

I picked this up for the agricultural history but was quickly taken with the excellent writing and comprehensive world history from ~13,000 years ago to present.

Flower Confidential
Amy Stewart

This is a look at the floriculture industry in the US, Latin America and Europe. It was eye-opening, and my single complaint is that for as much as the author talked about photo ops, the only photos are at the chapter openings with no descriptive information.