Troubleshooting Black Patches on Corn Plant (Dracaena fragrans 'Massangeana')

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Black patches could appear on leaf tips, edges, centers, or on the canes. Each location points to a different cause:

• Leaf tips/edges: Fluoride toxicity, low humidity, or inconsistent watering.
• Leaf centers: Fungal/bacterial leaf spot (often from water sitting on leaves).
• Canes: Rot from overwatering or physical damage.

Next Steps

1. Examine closely: where exactly are the patches?
2. Provide a photo if possible.
3. Ensure you're using purified water (you are) and watering only when top inch of soil is dry.
4. Avoid getting water on foliage.

General Corn Plant Care

• Bright indirect light.
• Snug pot—no repotting unless soil dries in <3 days.
• Fertilize lightly, half strength, monthly in growing season.

With location details, a precise diagnosis and treatment can be given.