I started a gardening business from scratch

This joke cleverly digs into the fertile ground of wordplay. The setup about starting a gardening business "from scratch" immediately primes us for a story of humble beginnings and hard work. But the punchline, "It was a grassroots operation," harvests a delightful pun, taking advantage of the literal and figurative meanings of the phrase.

The term "grassroots operation" is commonly used to describe something that starts small, at the most fundamental level, often with local support or community involvement, building upwards from the ground. Think of a political movement or a local club beginning with just a few dedicated people. In the context of a gardening business, however, the phrase takes on a wonderfully literal meaning: a business that literally deals with grass and roots! The humor blooms from this unexpected double interpretation, making a common idiom perfectly fit the specific, earthy subject matter.