I have 4 pine trees (not sure the type but they look like Christmas trees) in my back yard. They were planted at the end of May by the people that we bought the house from. One of them has turned completely brown (but still has needles on the tree but they are slowly falling off), and the others are beginning to turn brown near the edges.
I live in Maryland (USA) and it is the start of winter but not below freezing if it matters.
What should I do to save these trees? Is the one that is all brown already dead? Will it come back? Maybe I am not watering them enough? How much water should they get?