Q.Carolina Jessamine
2 years old, about eight feet of growth, recently all the leaves have died but some of the vines seem to still be green. What can be done to save.
It is difficult to say what has effected your vine. Check soil moisture levels.
Inspect the leaves for any signs of pests.
Did your weather play a part? Drops in temperatures or extreme heat?
Review the care information in the articles below. This may help you pinpoint a cause to your vines condition.
http://aggie-horticulture.tamu.edu/ornamentals/nativeshrubs/gelsemiumsemper.htm
https://www.gardeningknowhow.com/ornamental/vines/carolina-jessamine/growing-carolina-jessamine.htm