I have a friend who lives in town and he's tried Confederate jasmine twice. He planted it in the ground both times and it didn't survive winter either time. He's been growing Carolina Jessamine for years. The base of the vine had vines almost 3" in diameter. It appears to have not survived the February cold this time. Both of ours had survived a record setting -1F year before last which occurred for a few hours overnight. This time was much colder for a much longer duration. I just hope it's not the new 'normal' to have cold spells like this as a more frequent annual occurrance. Frisco and east Texas are surely more moderate in the winter months.
