Your 30-year-old, 6-foot Janet Craig (Dracaena deremensis 'Janet Craig') has chronic yellow/brown tips despite careful watering and saucer emptying. Common causes for this species:
Even one "too dry" event causes tip burn. Fix: Water when top inch dry—never let it go dust-dry.
Minerals accumulate. Fix: Switch to filtered/distilled/rainwater.
Use half-strength, monthly in growing season only. Flush soil quarterly.
Unpot, trim large bottom roots, add 1 inch fresh soil to pot bottom, reset. Do annually.
Peat mixes acidify over time. Fix: Add horticultural lime or gypsum to raise pH.
Trim discolored tips at an angle with clean scissors. If many leaves look bad, prune stems back to force fresh growth.
Email photos for specific diagnosis. This plant is a survivor—fine-tune the culture and it'll last decades more.
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