Arborvitae 'Golden Biota' Dying in Shade: Diagnosis

25 'Golden Biota' arborvitae (6 ft) planted in NJ (zone 6b) in shadier spot; browning by fall, dead by February. Nearby older arborvitae in sun thrive.

Primary Suspect: Insufficient Light

• Arborvitae need ≥6 hours direct sun for density and color.
• Shade causes thinning, browning, decline.
• 'Techny' arborvitae tolerates shade better than most.

Other Factors

• Soil differences: Test both areas (pH, nutrients, drainage).
• Waterlogging: Low-lying shade areas stay wet; roots rot.
• Winter burn: Exposed sites desiccate foliage.
• Animal damage: Deer browse; urine unlikely to kill 25 plants uniformly.

Action Plan

1. Soil test comparison (sun vs. shade area).
2. If shade is cause, replace with shade-tolerant evergreens: Taxus (yew), Ilex (holly), Rhododendron, or Leucothoe.
3. If soil issue, correct drainage/pH and replant same species.
4. Hire arborist/horticulturist for on-site diagnosis before reinvesting.

'Techny' arborvitae is best bet if staying with Thuja.