Answer: Thuja occidentalis or the American Arborvitae is a slow to medium growing tree that does well in a sunny location in good soil. The species would be expected to grow in a naturally pyramidal form but taller and much narrower than listed on your label. The name "Pyramidalis" seems to be used interchangeably for a number of different varieties of this tree, so it might be wise to rely on the label inforamtion about the mature size. Storm damage might occur (such as heavy snow breaking a branch) but the trees themselves are very hardy and are occasionally used in windbreaks. All in all, you might expect it to grow at most a foot a year.
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