the white stuff could be "white fly". ' n5 g1 r, P7 F( X QI 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. 4 L+ i7 p) g) Z0 a7 @/ N# ~& e' jHibiscus is a typical plant, show helps a lot.