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Planting Trees Near a Retaining Wall: Safe Distances and Root Concerns

For a 4-ft boulder wall, plant Thuja 'Green Giant' at least 36 inches (preferably 5 ft) from the wall face. Avoid trees with massive root crowns (oaks, etc.). Emerald Green Arborvitae is smaller and safe at 36 inches. Root crown size is learned from experience; no published database exists. When in doubt, choose smaller, slower-growing species.

Landscaping and Design: Shrub and Tree Selection for a Retaining Wall Over a Septic System; Screening Trees on a Retaining Wall: Arborvitae, Cypress, or Espaliered Fruit?; Does a Gentle Slope Need a Retaining Wall for a Patio? Montreal Case; Planting a Pear Tree Near a Retaining Wall: Spacing and Root Considerations; Retaining Wall Drainage: When Weep Holes Aren't Worth the Cost; Planting a Tree Near a Low Retaining Wall: Species & Root Barriers; Fast-Growing Shade Trees Near a Septic System: Safe Distances and Species for California Foothills; Planting a Birch Near a Mature Pine: Root Competition and Spacing; Tree Roots Lifting Retaining Wall: Repair Strategy; Tree Roots and Sprinkler Lines: Monitor, Don't Panic

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