Yellowing Leaves on Newly Planted Hydrangea Tree

Too Much Water or Fungus? Diagnosing a Stressed Hydrangea

A newly planted hydrangea tree (2 weeks in ground, full sun) shows progressive yellowing and black leaf edges. Landscaper said water every 4 days; rain reduced watering.

Likely Causes

• Overwatering in clay soil: "Every 4 days" + rain = saturated roots. Hydrangeas need moist but well-drained soil.
• Fungal leaf spot: Black edges suggest Cercospora or anthracnose.

Action Plan

1. Check soil drainage: dig near root ball; if soggy, reduce watering.
2. Apply Daconil (chlorothalonil) fungicide—broad-spectrum, safe if fungus not present.
3. Monitor new growth: if clean, problem solved.
4. Hydrangeas prefer morning sun, afternoon shade—full sun may be too intense.

Note

Tree form hydrangeas (H. paniculata standards) reach 8+ ft. Easy care once established.