Greener Than You Think is a satire rather than an adventure story. One plant (a Bermuda grass treated with a special growth chemical) slowly spreads across California and beyond, swallowing cities and making vast tracks of land uninhabitable.
One challenge with this book is that the narrator, Albert Weener, is unreliable. He sees himself as the hero whereas he is the villain and more of a monster than the weed. Plus the reader’s impression of events and characters is initially filtered through his (self-serving) point of view.
Also, the momentum of the story flags a bit in the middle, but the ending makes up for it (at least for me).