Brown Spots on chinese evergreen
What's Happening
Brown spots on Chinese Evergreen emerge from two primary mechanisms. EDEMA/CELLULAR RUPTURE: When overwatering coincides with high humidity (>70%), leaf cells absorb water faster than transpiration can release it, causing cellular burst that appears as water-soaked brown patches, often with yellow halos. FLUORIDE/SALT TOXICITY: Aglaonema is particularly sensitive to fluoride and mineral salts commonly found in tap water and fertilizer; accumulation at leaf margins and tips causes necrotic brown tissue. The thick, waxy cuticle makes leaves susceptible to edema because it limits rapid water vapor exchange.
How to Fix It
- 1
Inspect spot characteristics: Water-soaked appearance with yellow halo = edema; dry, crispy margins = salt/fluoride toxicity
- 2
For edema: Immediately reduce watering frequency and improve air circulation around plant; remove affected leaves to prevent secondary infection
- 3
For salt toxicity: Flush soil thoroughly with distilled water (3x pot volume); switch to filtered/distilled water permanently
- 4
Prune affected tissue: Use sterile scissors to remove brown areas, cutting 1/4 inch into healthy tissue to prevent spread
- 5
Repot if severe: Replace soil with fresh mix if salt buildup persists after flushing
- 6
Switch to bottom-watering: Place pot in water for 15-20 minutes, allowing soil to wick moisture without leaf wetting
How to Prevent It
Use filtered or distilled water to eliminate fluoride and salt exposure; maintain 40-60% humidity (not exceeding 70%) to prevent edema while supporting tropical preferences; allow soil to dry 2-3 inches between waterings; flush soil quarterly by running 3x pot volume of water through to leach accumulated salts; avoid misting leaves directly.