Answer: The idea behind recommending you plant high is that the earth settles after planting and watering and you wouldn't want your brush cherry to sink into moist soil. The moisture can cause the trunk bark to rot. So, instead of planting at the same level as the brush cherry was growing in the container (which is the usual recommendation for trees and shrubs), raise it up about two-inches. This will accommodate any sinking or settling and still keep the trunk high enough to avoid rotting. Hope this clarifies things for you!
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