the white stuff could be "white fly". 7 [4 N8 c3 `2 p: m% E: XI 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." s9 @9 m- L: g7 k1 `1 j5 f8 [
Hibiscus is a typical plant, show helps a lot.