The arborvitae I have all have growth on top but the bottom is bare. I have them planted behind my white vinyl fence and they are located in an alley where only 1 car goes up and down. I had the soil tested at Cornell as it seems anything I had planted back there does not do well. Hostas are OK and pachasandrya are OK but the trees that have been planted back there all seem to die. Any suggestions? I want privacy and to block the noise coming from the main street.