I planted 24 thujas from Lowes about 3 weekes ago and they are slowly turning brown. I watered them about once a day once every two days for the past 3 weeks and now I water them twice a day (early morning and evening). Not all of them have this problem but at least half (12). Few of them were planted close to large oak tree but I don't see any connection between location where it was planted. They get about 3-5 hours of full sun. Here are pictures:
Thanks, Jack