the white stuff could be "white fly".) p% m; i c; ~/ t _% y
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.) t* q1 C- B( l! y8 P. ^4 y7 a! l
Hibiscus is a typical plant, show helps a lot.