Hello, last September we bought 17 Arborvitaes. We live the North east. We had a very cold and long winter. Now my Arborvitaes are starting to turn brown and dye. My landscaper is giving us a hard time getting these replaced and I think they might have been planted too deep. Has anyone seen this and what should I be doing to help them. Is it too late. I fear it is for a few which are now all brown.