the white stuff could be "white fly". ) f( \: i1 m2 f3 o$ h. @- e; f/ S( OI 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.7 E7 ]6 G* x; `
Hibiscus is a typical plant, show helps a lot.