the white stuff could be "white fly".8 p1 K5 j4 S V6 F; z$ j: g# S
I 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. $ d2 N7 s) H: l7 uHibiscus is a typical plant, show helps a lot.