Q.Potted lime tree exposed to freezing temperatures be saved?
Can this potted lime tree be saved?
Your lime tree might survive- it can be hard to tell until springtime comes how well it's going to recover. First, protect it from any future frosts by moving it indoors or covering it if more cold weather is predicted. Next, don't prune the tree until spring. Wait to see if it starts to grow leaves, and at that point it will be easier to tell which parts are dead and which are alive, and you can prune accordingly. Also see these articles:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-treat-frozen-plants.htm
https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm