the white stuff could be "white fly". 7 n; { l& m& w( u4 e; SI 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.9 d% I) {( K, d3 ?* w$ e0 _+ k& d
Hibiscus is a typical plant, show helps a lot.