the white stuff could be "white fly". - h6 ~( [$ Z- d9 c% 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. 4 n5 D# D5 y6 [) N5 [3 u( KHibiscus is a typical plant, show helps a lot.