the white stuff could be "white fly". ) ~; e2 Q p& t, c3 u; C% D% |8 ~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.# P' i2 E4 P- h% S2 ~
Hibiscus is a typical plant, show helps a lot.