Answer:Arborvitae will tolerate a moister soil than many evergreens, but they will "drown" if kept overly wet. Generally, the idea for newly planted shrubs is to water more often at the very beginning and then decrease it gradually so that watering about every five days to once a week is usually enough. As the weather cools you may not need to water at all. The only way to know for sure is to check by digging into the soil to see. The aim is to keep it moist but never soggy sopping wet. An occasional deep watering is more effective than a daily light sprinkling, and the rule of thumb during the growing season is "an inch a week from the sky or the hose" -- this is most important during the summer months and should be followed for the full year after planting. A layer of several inches of mulch will also help maintain an more even soil moisture and temperature.
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