Answer: Nebraska is among the most difficult parts of the country in terms of growing conditions. Even the best growers are going to be affected by the overall climate, the weather each year and the specific site where the plant is planted. So you will always see growth expressed as a range rather than a specific number. In your case, I would expect growth at the minimum end of the range and be very pleased if the weather cooperates and the plant does better than that in a given year. Arborvitae are generally considered as growing at a slow to medium rate, which could mean roughly about six to twelve inches a year as slow and twelve to 18 inches a year as medium. So a relatively fast growing arborvitae might grow up to 18 inches a year at best under great conditions. Arborvitae do better with a soil that is evenly moist, so careful watering and some winter wind protection would be helpful their first few years during their establishment period while they are trying to become fully rooted in their new location. In a sense, both nurseries are right -- based on my experience, I would probably say with good care look for about a foot give or take a few inches. I hope this helps.
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