Holly-tone for Arborvitae? Yes, But Not for Browning Foliage

Reader Question: Is Holly-tone Safe for Arborvitae? One Is Browning.

"Can I use Holly-tone on arborvitae? One new plant is browning (not from drought). I forget if Holly-tone helps or hurts."

Expert Answer: Holly-tone Is Fine—But Won't Fix Browning

Holly-tone (Espoma) is an excellent acidifying organic fertilizer for arborvitae. Apply lightly in early spring before new growth.

Browning ≠ Nutrient Deficiency

Typical nutrient deficiency signs: pale green foliage that doesn't darken in spring, sparse branching, slow growth. Browning is usually caused by:

• Poor drainage / standing water
• Root rot (Phytophthora)
• Insect damage (spider mites, bagworms)
• Herbicide drift from lawn treatments
• Winter desiccation

Fertilizing a stressed, browning plant can worsen root damage. Diagnose the cause first.

Action Plan

1. Check soil drainage—arborvitae hate wet feet.
2. Inspect for mites (tap branch over white paper; look for moving specks).
3. Rule out herbicide exposure.
4. If drainage is the issue, improve it or relocate the plant.
5. Fertilize only healthy plants in early spring.