What is a recommended planting depth guideline for trees and shrubs during transplanting?

• A. Plant 2-3 inches below the previous soil line.
• B. Plant at the same depth as the container or root ball; root flare is at or slightly above grade.
• C. Plant 6 inches above the original soil line to promote drainage.
• D. Plant deeper than the root ball to encourage rooting.

Answer: (B)

Planting depth matters because the root system needs a proper interface with the soil, air, and moisture. The best approach is to place the tree or shrub so that the root flare—the point where the roots meet the trunk—is at or slightly above the soil surface. This matches how the plant rested in its container or root ball and allows roots to establish without being buried too deep. If the plant is set deeper than this, trunk tissues stay wet and can rot, or girdling roots may develop where the trunk is buried. If planted too shallow, the root ball can dry out and the plant risks instability. So, the recommended guideline is to plant at the same depth as the container or root ball, with the root flare at or just above grade.