Thuja Green Giant Root Concerns Near a Pool

Root Spread and Pool Risk

Thuja 'Green Giant' roots extend 10–15 feet from the trunk at maturity. Planting 4 trees within 5 feet of an in-ground pool in zone 9 (Luling, LA) poses risks:

• Vinyl liner pools: Roots can penetrate seams and cause leaks.
• Concrete/gunite pools: Roots may exploit cracks but rarely cause structural failure.
• Soil moisture: Irrigation for the trees can saturate backfill around the pool.

Recommendations

1. Increase distance: Plant at least 10–15 feet from pool walls.
2. Root barrier: Install a 30-inch deep HDPE root barrier between trees and pool if closer planting is unavoidable.
3. Alternative screening: Use clumping bamboo (with barrier), upright hollies, or ornamental grasses for poolside privacy.