“Let It Grow” appears near the end of the 2012 animated film The Lorax, where the people of Thneedville embrace restoring trees to their city. The ensemble number was written for the film’s climactic resolution and combines a conservation message with an exuberant musical finish. Online, excerpts became useful for transformation edits, ironic environmental jokes, and memes about anything multiplying or improving rapidly. Its clear refrain, escalating energy, and recognizable connection to The Lorax keep it effective even when removed from the original scene.