2 wks. ago we planted Exelsa cedars to form a hedge. They are 7-8' tall and appear to be in very good health. I'm quite worried though, as I've had warnings to not over-water, but also been told to definitely not let them dry out! We placed a bit of bone meal in each hole, and have put the soaker hose on them twice a week, unless we had some rain, then we skipped the watering. We know we have some clay content in our yard, and some sand, it is a new subdivision and the fill they've used is not great. Any advice on how to try to improve their odds of survival? I've seen entire hedges die before,and would really like to avoid that! thanks!