Dizzyhead

Source
3 dizzyhead, in addition to 3 mudleaf and 3 gloomberry are required for the quest Swamp Bouquet, given by The Old Beldame, who is located in Swamp Witch's Hut.

You can pick dizzyhead in Swamp Witch's Hut, or alternatively you can purchase them from Bokken at Oleg's Trading Post