I have a sick Millettia Reticulata wisteria shrub that was doing fine then it got over 100 F. The leaves started to vein and fall off. I've got other wisteria vines. I just throw some Hi-Yield iron+ on them and it's fine. This shrub got worse. The pH is 6 and it's wilting and blooms are falling off. I used super-thrive in water alone, no fertilizer, nothing. I don't have much time. Any ideas?
You likely need to increase watering to the plant.
It has most likely dropped leaves to protect the roots from the heat and dry conditions.
Here is a link to refresh you on the care requirements.