What are the motifs in The Botany of Desire by Michael Pollan?

Gardening is a recurring idea in the book. The publisher—and therefore presumably the author—categorizes the text as a Nature/Gardening book. This is accurate, but the text is unfortunately commonly viewed as a sort of primer on the science of evolution with an emphasis on co-evolutionary trends. The text does little to dispel such notions, using much scientific jargon, reporting various scientific findings, appealing to science often and even reporting various statistics. All this lends the text a general tone of "scientific" reporting. Unfortunately, the book does a fairly poor job of explaining evolution, co-evolution and natural selection. Artificial selection and gene flow, topics which receive better development, are accurately presented but are not central to the text's development.