The Wizard of Oz - The first green roof on film?

Today marks the 75th anniversary of the Wizard of Oz. 75 years!!! Do you remember the scene, soon after the intrepid travelers meet the tin man, that the wicked witch tries to turn the scarecrow into a bonfire? (If you've got the movie there, fast forward to the 46:20 mark). I've watched a lot of old movies and as far as I can tell, this may be the first green roof on film!

Perhaps I should start a series of green roofs in popular culture?