I planted arborvitae about a month ago with top grade soil. The holes were 3 times the size of the root ball and the ball was planted an inch above ground level. I then added soil to give it a rounded affect along with mulch. I have been watering them every few days for 1 hour with a soaked hose. 4 of the 5 plants seems to be doing good. 1 or 2 branches out of 100 are brown. The one pictured has a lot more brown than the others and I fear it’s slowly dying. Should I be worried or is this normal?