Question: Plant Code THDA1861
Mature size is listed at 8-10' tall x 24
Answer: Your thuja will max out at 2' in width at maturity so plant them on 24" centers. I would plant them 3' from the wall to provide space for good air circulation and access to the wall if it is ever needed.
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When singular and plural spellings differ, as in peony and peonies, try both.