Is it recommended to add amendments to backfill soil for transplanting trees?

Adding amendments to backfill soil when transplanting trees is generally not recommended because it can create a stark contrast between the amended backfill and the native soil. This can lead to issues such as poor root growth and drainage problems. Trees naturally grow in a variety of soils, and amending the backfill can encourage roots to stay within the amended area instead of spreading out into the surrounding native soil, which can lead to a root system that is not well established.

The native soil provides a more stable environment for the tree to adapt, offers better drainage and aeration, and promotes healthy root growth as the tree spreads out to seeking nutrients and water. Instead of adding amendments, it is typically suggested to use the native soil for backfilling to ensure a consistent environment that the tree can thrive in post-transplant.