Brown Spots on Potted Hydrangeas: Fungal Leaf Spot and Watering Fixes

Likely Cercospora Leaf Spot

Common late summer/fall, worse on stressed plants after heavy rain. Rarely fatal, just ugly.

Monthly fungicide May–Sept if recurring.
Fertilize often with quality slow-release or fish emulsion (cheap water-solubles build chlorine, causing tip burn).

Soil Issues: Diagnosing Curling Leaves on Newly Planted Citrus Trees; Orchid Leaf Damage in Unconventional Potting: Diagnosis; Cattleya Leaf Rot After Early Watering: Save the Pseudobulbs; Orchid Leaves Turning Brown: Insects, Watering Timing, or Bacterial Rot?; Nepenthes Yellowing Leaves: It's Not Always the Soil – Check Light, Water, and Temp; How to Fix Yellow Leaves on Ivy and Make It Bushy; Peace Lily Black Leaves: Soluble Salt Buildup from Bottom Watering; Parlor Palm (Chamaedorea) Pests: Scale + Fungus Gnats—Treatment Plan; Mandevilla Leaf Browning: Fertilizer Burn Diagnosis; Leaf Biology: Photosynthesis, Structure, and Seasonal Cycles

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