I live in Maryville (Eastern) Tennessee. We have had a lot of freezing weather this winter. My 12 year old Italian Cypress trees line about 100 ft of my property line. About 3 weeks ago they began showing brown/dying needles f rom the bottoms up. I had recently put a lot of pine mulch under them. Are they rebounding from the winter or do I have other problems? I have fertilized each one with vigero evergreen tree stakes. Thanks.