Emerald cedar, aka as white cedar or arborvitae is not a bad hedge. They are not a pest like eastern red cedar. Once established they do not have a high water requirement. I would select shrub as the plant and use a coefficient of .6. That should do the trick. Make sure you use the correct precipitation rate for your sprinklers. I do not know if you shared which sprinkler you are using. These plants do not have a deep root system like other shrubs. Try a custom root depth of 12 inches.
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