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

This joke cultivates its humor through a delightful bit of wordplay, specifically a pun. The clever twist hinges on the double meaning of the word "plot." In the context of television, a "plot" refers to the storyline or narrative of a show, the sequence of events that keeps viewers engaged. Simultaneously, in gardening, a "plot" is a small area of ground used for planting. The punchline then uses the phrase "grows on you," which means something becomes more appealing or enjoyable over time, but also literally describes how plants develop in a garden plot. This dual interpretation is what makes the joke sprout a laugh.

The real-world context adds another layer of amusement. "Binge-watching" is a modern phenomenon, popularized by streaming services, where viewers consume multiple episodes of a show in one sitting. The idea of applying this intense viewing habit to a typically slow-paced activity like watching a gardening show creates a humorous contrast. While gardening might seem like an unlikely candidate for a marathon viewing session, the joke playfully suggests that even the most unexpected subjects can become surprisingly captivating once you let the story, or indeed the plants, take root.