Friends - my first struggle with gardening. I have attached a picture of one of the tree/arborvitae in my front yard which suddenly started drying out in the middle. I do not see any problems with any of the remaining trees (4 of them) or even in this tree elsewhere.
Any ideas of suggestion what might be wrong or how I can correct this.
It was a cold winter in New England but nothing different than normal. Not much of snow either.