Negima!? Magister Negi Magi Episode 11: Huh, So the Baron Is a Kind of Rose. I Thought It Was a Kind of Potato.
Episode 11 of 26 of Negima!? Magister Negi Magi, aired December 13, 2006, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Negi, Asuna and the Chupa Team start a hunt to find the Black Rose Baron but can they find him before arousing suspicion that Negi is really a mage?