I went on a date with a gardener.

This joke plants a seed of humor in a classic case of wordplay, specifically a pun. The punchline cleverly twists the common idiom "grow our relationship." While a gardener literally helps things grow from the earth, in the context of dating, "growing a relationship" metaphorically means developing it, nurturing it, and making it stronger over time. The humor sprouts from this unexpected literal interpretation, made perfectly logical by the gardener's profession.

The comedic effect comes from the delightful collision of these two meanings. We expect the gardener to talk about plants, but then they apply their professional vocabulary to the realm of romance, giving a familiar dating phrase a fresh, literal, and funny spin. It’s a playful nod to how our professions can sometimes influence our everyday language, even when we’re looking for love. The joke blossoms by taking a well-known concept and giving it a charmingly unexpected twist.