the white stuff could be "white fly".' @, f0 i- s3 k; f4 W# {4 S$ \. t! @
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. / h# [+ _% k9 |6 u! p5 V% r! {" JHibiscus is a typical plant, show helps a lot.