the white stuff could be "white fly". 2 _6 r6 K& F4 j$ x. Y8 Y& pI 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; a4 @# P$ R# y5 GHibiscus is a typical plant, show helps a lot.