I live in North Georgia, have grown Star Jasmine several times and have never had a problem with it. It actually seems to be a pretty hardy plant. However, I have 2 star jasmine plants that have taken a turn for the worse. They thrived last summer, which was it's 2nd summer. At the end of the summer, one of them got mealy bugs. Many of the leaves dropped off, and the ones that remained got black. I let it be through the winter. A few weeks ago, I got all the black (or most of it) off the leaves which were really green. I took off the top layer of mulch and dirt and put down some fresh manure and a fresh layer of mulch, and gave it a good watering.. Now the leaves look like they're turning yellow. I thought for sure it would at least sprout some new leaves and start to fill in. The sad part is I'm pretty sure it's not going to bloom this year since it's disease. I'm really at a loss on what to do. I feel like yellow leaves means it needs water, but I don't want to water it and have it get water logged. My pots drain very well, so Im pretty sure it's not holding water.

I attached before and after pictures..

This is last June. They were doing great. They were a quarter the size the summer before.

These are the mealy bugs from last October. They were just on the jasmine on the right.

This what the right one looked like in Feb.

And these are the left and right one today. (April 2019). Now the leaves are turning yellow.. but I'm afraid to water it. I know jasmine loves water, (well drained).. but I just gave each pot a gallon last week with some miraclegro.

LEFT

RIGHT

ANY HELP WOULD BE HUGE!!!