Answer: Based on your description it is very difficult to make a guess as to why they have not done well. Newly planted trees and shrubs need ample moisture during the establishment period so if you have not watered carefully that might be one possible reason. Watering should be done slowly and deeply with the rule of thumb being an inch or two a week from either the sky or the hose; it's a good idea to dig down and see exactly how effective your watering is so that you can judge how much you need to apply to soak the entire root zone. A daily light sprinkling is not sufficient. In addition, several inches of organic mulch should cover the root zone to help keep the soil cool and moist. On the other hand, it is possible there is an insect or disease or soil problem. I would suggest you consult with the supplier and also perhaps with your County Extension for a more specific dagnosis. I'm sorry about your arborvitaes.
Q&A Library Searching Tips