If the root ball is exposed, adding more soil up to the previous soil level should cause no problems, especially if you use a well-drained soil to backfill. However, avoid filling in around the plant so that the root system is buried deeper than it was originally growing. Yuccas like it on the dry side. Burying the roots too deeply can suffocate them, and planting in a depression could hold water around the crown and cause rot.
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