Strange! Mystery of the Wilting Flowers (怪奇!枯れた花のナゾ, Kaiki! Kare ta hana no nazo), or Pierrot's Blue Rose is the seventh episode of the 1992 series of Calimero.
In this episode, Pierrot shows a blue rose in class and his friends want to see more of them. But it turns out Pierrot just painted the rose blue. His mother thinks that it is his fault that her other flowers are wilting. Calimero and the others help him find out who's really behind it.