the white stuff could be "white fly". 4 X% ~. ~) k4 @# c& x5 ?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. , x- G q8 d2 n" ~& J# M) X6 fHibiscus is a typical plant, show helps a lot.