the white stuff could be "white fly". / n; r: @* `& x* J6 n; Y) b+ YI 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. # h9 F% E! S4 w0 I. x0 n( ]2 g7 E& A: hHibiscus is a typical plant, show helps a lot.