Despite the ~10,000 year history of humans gardening around the world, this book is very Euro-centric, mostly about the inventions/developments of Europeans in 18th and 19th centuries, and the outright stealing from other places and countries Europeans did in the 16th and 17th centuries.
We don't hear about much about how a plant was cultivated or tool was developed in in India or Peru or Haiti, etc. but rather which European strode in and brought it back to Europe and stamped his name on it.
Also, I don't know if it was budget or licencing issues, but the book only has illustrations from one early guide to plants done in pretty 19th century watercolors, and no actual illustrations of the people he talks about, no maps of where things came from and migrated, and almost no pictures of the plants and tools each section is actually talking about.
And I think it would have been better organized chronologically, rather than the loose structure here by subject area.