20-Year-Old Maranta (Prayer Plant) Leaf Cycle: Water Quality and Humidity

A 20-year-old maranta that cycles through green → brown tips → full browning → regeneration is reacting to suboptimal conditions, not dying. Your care has kept it alive decades—impressive!

Likely Culprits

• Water quality: Hard water or fluoride causes tip burn. Switch to distilled, filtered, or rain water.
• Fertilizer: Stop fertilizing. Marantas are sensitive to salt buildup.
• Temperature: Keep above 65°F. Avoid cold drafts.
• Humidity: Critical, especially when heating runs. Use pebble tray, humidifier, or group plants.
• Spider mites: Check leaf undersides for dust-like specks and fine webbing.

Watering Adjustment

"Moist but drained" is correct, but weekly may be too frequent in winter. Water when top half-inch is dry. Your tendency to overwater is balanced by good drainage—hence 20 years of survival.

Address these factors and the brown-tip cycles should reduce or stop.