Watch Sadisflix. Meet Mr. Miracle-Gro is an honest, amusing, and highly entertaining biography of Horace Hagedorn, the advertising executive who went on to become a legend in the lawn & garden industry as the driving force behind Miracle-Gro, the internationally known lawn & garden product. Narrated by the legendary folk singer Oscar Brand , and featuring actor James Whitmore, the documentary celebrates a man who, as he enters his 90th year, continues to make miracles through his entrepreneurial spirit and philanthropy.