Seems to me a story about getting so caught up in something and the ideas therefrom that they serve as therapy.
The first few paragraphs describes a man, with a garden, who suffers from alcoholism and nicotine addiction and is thoroughly unsatisfied with conventional means to deal with them. So he focuses on his garden, imagining how much better the world would be if it was like a well-maintained just like it.
But the writing goes on, in detail, about things that don't seem all that important. I mean, this was supposed to be a story about fixing the world and overcoming vices. Why do I need to know about chainsaws and soil acidity? Beyond the introduction, most of the description revolves around the garden, describing things within or relating to it. It makes the writing feel unfocused, like the point has been lost amid the author's love of gardening.
And that's the point. The "author" here is Candide. There are no quotations, yet we see his thoughts clear as day. This short piece is the recording of this character's thoughts. He becomes so focused in the minutia of his hobby, that everything else is superfluous, including his thoughts on how the world should be. Even as he praises the joys of gardening so much that he wants to write a novel about it, the man's problem has already been solved.
The key to this is in the final paragraph, with the oddly specific list of things that he bought with the advance paycheck. Specifically, alcohol and cigarettes are nowhere to be found. His own hobby saved him for no other reason than he became absorbed in it.