Leaves are needed to produce energy for the plant to thrive. Once a plant changes its focus to producing flowers and/or seeds it will sacrifice its energy source to better focus on the flowers getting all the energy it has previously stored. The process of producing its final product is very stressful on a plant. It is fairly normal for a plant to look like it is in its final death throes at that stage.
they look great dont add much at the moment i suggest a topdress with high p and k scratched into the surface