What type of music do flowers like best?

What type of music do flowers like best? is a science project that Rodrick made in middle school. Rodrick placed flowers in rooms around the house where music was played. All the flowers died within a week, which Rodrick thought was because of the music. Susan explains that the plants died because Rodrick never watered them. Greg sees this project in a warehouse in Diary of a Wimpy Kid: Hard Luck, and seeing one of Rodrick's projects is what ultimately convinces him to leave.