the white stuff could be "white fly".9 U2 _+ c2 E% j. k4 `% H0 A. P) P
I had the same problem before. It because your plant is too wet. I showed the leaves twice a day for a whole week, then the white filies were all gone.; J m E3 `4 K% R
Hibiscus is a typical plant, show helps a lot.