the white stuff could be "white fly". $ p, b8 X/ G1 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. 1 d6 h. U& |; \4 W5 w- c( \1 Z, RHibiscus is a typical plant, show helps a lot.