Fertilizing Wind-Stressed Green Giant Arborvitae

Yellow-Brown Tips on Established Green Giants After Extreme Winds

A homeowner planted 21 eight-foot Green Giants 1.5 years ago. They survived 100+ mph gusts but show yellow-brown outer foliage. They ask about using Costco's 10-5-7 azalea/evergreen fertilizer.

Cause: Wind and Transplant Stress, Not Hunger

The discoloration is likely from desiccation and root disturbance during the first winter—not nutrient deficiency. Fertilizer won't fix physical stress damage.

Fertilizer Guidance

• 10-5-7 is fine (N-P-K = nitrogen-phosphorus-potassium).
• Rate: ~1 cup per foot of canopy spread, scattered under drip line, watered in.
• Timing: Spring and early fall. Not summer, not late fall.
• Better option: Slow-release 10-10-10 or 18-6-12 at 1 lb/inch trunk diameter.

Recovery Focus

1. Water 1 inch/week during dry spells (deep, infrequent).
2. Maintain 2–3″ organic mulch.
3. Wait—new growth will replace damaged foliage if roots are healthy.

Key Takeaway

Wind-stressed Green Giants need water and time, not heavy feeding. Light spring fertilization with balanced fertilizer is fine, but don't expect it to "green up" windburn.