The phrase is a common French construction that circulated online in its misspelled form c'est moi qui l'est ai planté, while searchers usually type the corrected c'est moi qui les ai plantés. Shared as a short soundboard clip, it spread through meme edits where the gardening meaning is taken literally or used ironically for anything someone claims to have started. Its appeal comes from the proud, self-satisfied delivery, which lets creators turn an ordinary planting moment into a declaration of authorship that French-speaking audiences recognise instantly.