Answer: Arborvitae will not sprout from old wood, so depending on the age of the plant it may or may not regrow at the base -- more likely not. I am not certain what is causing the problem, however loss of lower foliage first moving upward is often caused by overwatering; it can also be a sign of an infection such as a fungal problem or it might be due to a pest problem. Arborvitae will also grow thinner in shade, it actually prefers full sun and needs a minimum of a half a day of direct sun so the loss may be related to the location. I am not certain why you planted it so high, usually within a half inch is about right as it allows for some settlement over time. This is a plant that does best in evenly moist, organic and humusy soil. It should not be sopping wet, damp like a wrung out sponge is good. If your soil is heavy clay, or if you are watering daily, it is possible you have overwatered it. Hitting the foliage with water while watering can also contribute to disease development. All in all it is very difficult to diagnose this type of thing long distance. Since this is a new plant I would suggest you work with your professional nursery staff and/or county extension to determine what has caused to foliage to drop and then work from there. I'm sorry you are having trouble with it.
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