Leaves Turning Yellow on a Hibiscus?

If you are giving the plant adequate water, then it probably needs iron. Use a product called IRONITE.

THANK YOU FOR YOUR RESPONSE. SOMEONE TOLD ME THAT EPSON SALT WOULD PROVIDE PLANTS WITH IRON. MIX 2 TABLESPOONS WITH A GALLON OF WATER DAILY......ALSO CAN ADD MIRACLE GROW WITH THE SALT.

THANKS ....TUEY