I told my friend I was binge-watching a show about gardening.

The humor in this joke sprouts from a clever bit of wordplay, specifically a pun. The punchline hinges on the double meaning of the word "plot." In the context of a TV show, the "plot" refers to the storyline or narrative that keeps viewers hooked, making them want to watch more. But in the world of gardening, a "plot" is quite literally a patch of ground where plants are grown. This delightful linguistic twist is what makes the joke bloom, creating a surprising connection between two seemingly unrelated ideas.

The joke plays on our modern obsession with "binge-watching" thrilling dramas and action-packed series, contrasting it with the generally perceived tranquility and slowness of gardening. While a show about gardening might initially sound like a snooze-fest to many, the joke cleverly suggests that even the most seemingly mundane subject can develop an engaging narrative that "grows" on you, much like a garden's plants slowly but surely expand. It’s a gentle nod to how unexpected things can capture our attention, especially when a good story, or a good pun, is involved.