Replacing soil disturbed roots. Wet soil at purchase = overwatered at store. You added dry soil, but if watering frequency didn't change, new soil gets wet too.
If new growth is clean, old leaf spots are just age/fluoride history. Trim tips at angle.
North window = low light. Keep within 5–6 ft, uncovered. Consider moving to east/west for better growth.
Wait for new growth before feeding.
Stop repotting, fix water, give time. Your plant will stabilize.
Diagnosing Brown Spots and Yellowing Leaves on Chitalpa in Alkaline Soil
Nepenthes 'Miranda' Black Spots: Severe Light Deficiency
Variegated Schefflera New Leaves Brown/Red: Acclimation Stress
Reviving a Drought-Stressed Champa (Plumeria) and Boston Fern
Mass Cane (Dracaena massangeana) Brown Spots: Fertilizer Burn on Drought-Stressed Plant
Fungus Gnats in Corn Plant: Soil Management Solution
Dracaena Massangeana (Corn Plant) Decline: Fluoride and Overwatering
Brown Sheaths on Anthurium: Normal Aging
Black Spots on Philodendron Xanadu: Harmless or Scale Insects?
Ponytail Palm Brown Leaves: Normal Shedding or Root Rot?
Anthurium Brown Leaves: Epiphyte Care (Not Soil Plant)
Dracaena Leaf Tip Burn: Causes & Solutions for Brown Edges
Pruning an Overgrown Corn Plant (Dracaena fragrans) to Ceiling Height
Corn Plant (Dracaena fragrans) Stalk Death: Watering, Light, and Realistic Height
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