I read a lot of books that could be classed as apocalyptic fiction, and I've never seen anything like this before. I'm not sure it's 100% unique, but it's certainly unusual. It's not an amazing book, but it's worth a look if you're a fan of the genre.
The book is written as if it's the personal account of events as described by a single character, Albert Weener. Weener starts the story as a salesman who makes a deal with an eccentric scientist to sell her new formula that will help farmers grow crops in difficult conditions. Her intention is to use the chemical to stop starvation and the intention is to enable a certain class of plants to gain nourishment from otherwise useless soil, rocks etc. Unfortunately, Weener is too lazy to visit the nearby farming communities and sells the chemical as a lawn treatment. Of course, the formula works and the grass grows at an astonishing rate. In fact, it works too well and nobody can stop it.
The rest of the book concerns the struggle to halt the grass as it gains more and more momentum. This idea is interesting, and almost the opposite of a few classic apocalyptic tales like 'The Death of Grass' by John Christopher. Unfortunately, the book was ruined for me by the lead character, Weener. It's deliberate, but he comes over as really selfish, short sighted and arrogant. It's hard to stick with him through the story when a lot of things he does are so annoying.
In short, a nice twist on the disaster theme. It gets a bit annoying in the last third of the book, but stick with it for a reasonable ending.