the white stuff could be "white fly".4 K* x6 o: d0 q% Y3 w2 |8 W
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.) y0 W$ c: p2 U: t3 p
Hibiscus is a typical plant, show helps a lot.