Answer: If you're seeing new growth from the roots, your plant is still alive. Prune away all of the dead vines, plus those with yellow leaves. In your region the plant should be evergreen, or at the very least semi-evergreen. This means that it should retain most of its leaves during the winter months. Pink jasmine grows fast so even if you cut it down to ground level each year it should be able to cover a trellis by the end of summer. The symptoms you describe could have been due to winter stress or transplant stress. Just cut away the unattractive old growth to make room for the healthy new growth.
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