Yellowing of the leaves is normal midway to the end of flowering. The plant is using up its stored energy. It should be a gradual and not rapid yellowing. Have you checked you PH?

If you believe you have the grow under control then its most likely natural yellowing in the flowering stage.

If you dont think it is then copy and paste the troubleshooting form from the plant problems section and fill it out. It will be much easier for people to diagnose a problem with the form completed.
GetThisOrDie Reviewed by GetThisOrDie on . plant is really light green almsot yellow w/ pic ok first of i want to say this is my friends plant and him and i are both medical patient.. the plant just keeps getting brighter ..it just started its 4th week into flower. we also have been feeding it fox farms nut. from week 5 -7of their chart ..i just didnt add open sesame.we feed with every other watering Rating: 5