Techny Arborvitae Not Dense: Spacing, Water, and Mulch

Why They're Thin and Yellowing

Techny arborvitae have shallow roots and high water needs. At 5 feet tall after 2 years, poor density and yellowing suggest:

• Inadequate spacing: Plant 9–10 feet apart, 14–16 feet from large trees.
• Moisture competition: Nearby trees steal water.
• Hot summers: They prefer cooler climates.

Remediation

• Water deeply twice weekly during dry spells.
• Apply 3 inches of shredded bark mulch to conserve moisture.
• Avoid fertilizing now; focus on hydration.

Realistic Outlook

At 5 feet, transplanting is difficult. Improved care may thicken growth over time, but full density may not return if spacing is fundamentally wrong.