Green Giant Arborvitae Placement: Root Risks to Foundations

Planting Green Giant Arborvitae Near Structures

Green Giant arborvitae (Thuja plicata) are fast-growing, majestic evergreens often used for privacy screens. However, their mature size demands careful placement relative to buildings.

Mature Dimensions and Root Spread

These trees can reach 70 feet tall with a 15- to 25-foot base spread. A general rule: roots extend as far as the canopy and can penetrate as deep as the tree is tall. Planting only 5 feet from a basement wall risks future root pressure on the foundation, potential cracking, and moisture issues.

Recommended Action

Relocate the trees to at least 15-20 feet from the foundation. If moving isn't feasible, consider removing them and choosing a smaller cultivar or alternative species like dwarf conifers, upright junipers, or columnar hollies that provide screening without aggressive roots.

Alternative Screening Options

• Emerald Green arborvitae (12-15 ft tall, 3-4 ft wide)
• Skyrocket juniper (15-20 ft tall, 2-3 ft wide)
• Skip laurel or holly varieties for broadleaf evergreen screens

Early correction avoids costly foundation repairs and preserves the tree's health. Consult an arborist for site-specific advice.