Yellow during flower cycle is tricky to deal with. Most of the time you compare the leaves around the one in question. If the others leaveā??s are fine and the plant looks fine then there is no problem. The plant will use up some leaves and they will turn yellow. Just pick them off and don't worry it natural.

At that stage you really judge the plant as a whole and not by individual leaves just watch new growth and see how they look. I don't mean to wait to long to act if there is a problem just don't over react.