Emerald Green Arborvitae Spacing: 3 ft or 4 ft?

Emerald green arborvitae hedge: literature says 3–5 ft spread. Planned 4 ft spacing, worried they won't touch. Asked if 3 ft safer, or 4 ft okay with air circulation.

The expert said 4 ft okay with yearly fertilizing (Holly-tone) and pruning for uniform height. Watch for bagworms (look like cones, actually caterpillar cases). Spray Bt (Bacillus thuringiensis) for control.

Spacing & Care

• 4 ft spacing works with care.
• Fertilize yearly.
• Prune for uniform height.
• Scout for bagworms; treat with Bt.