Corn Plant Brown Tips: Fluoride Sensitivity vs. Salt Buildup

While Dracaena species vary in fluoride sensitivity, corn plant (D. fragrans 'Massangeana') is only mildly sensitive. Your brown tips and yellowing with 0.8–1.2 mg/L fluoride water are more likely from:

Primary Suspects

• Excess soil salts from hard water or over-fertilizing. Switch to distilled, filtered, or rainwater. Stop fertilizing—corn plants are light feeders.
• Underwatering letting soil dry too much concentrates minerals. Water thoroughly when top quarter of root ball feels dry.
• Soil pH: Maintain 6.0–6.8. Fluoride becomes insoluble in this range, reducing uptake.

Perlite and Fertilizer Notes

Normal perlite amounts are fine if pH is correct. Avoid superphosphate fertilizers (fluoride source). A peat-based soilless mix with added perlite is standard and safe.

Action Plan

1. Switch water source.
2. Halt fertilizer.
3. Water on schedule—never bone dry.
4. Test soil pH; adjust with lime if below 6.0.
5. Trim brown tips cosmetically.

These steps resolve 90% of corn plant tip burn cases.