brown tips on Begonia
Quick answer
If your Begonia has brown tips, the most likely cause is: Begonia leaf tip browning and marginal necrosis results from a combination of low ambient humidity and dissolved mineral salts in tap water. When indoor RH drops below 50%, leaf margin hydathode pores desiccate first due to high surface-area-to-volume ratio of marginal tissue. Combined with mineral salt accumulation from hard water (common in humidifiers), this creates osmotic stress that compounds humidity-driven desiccation.
Start here:
- 1. Diagnose correctly: mineral burn from tap water causes crispy tips with white crusty deposits; pure low humidity causes dry crispy tips without deposits
- 2. Switch to filtered or distilled water in humidifiers to prevent calcium/magnesium deposits on leaves
Why Begonia gets brown tips
Begonia spp.
Begonia leaf tip browning and marginal necrosis results from a combination of low ambient humidity and dissolved mineral salts in tap water. When indoor RH drops below 50%, leaf margin hydathode pores desiccate first due to high surface-area-to-volume ratio of marginal tissue. Combined with mineral salt accumulation from hard water (common in humidifiers), this creates osmotic stress that compounds humidity-driven desiccation.
How to reverse brown tips on Begonia
- 1
Diagnose correctly: mineral burn from tap water causes crispy tips with white crusty deposits; pure low humidity causes dry crispy tips without deposits
- 2
Switch to filtered or distilled water in humidifiers to prevent calcium/magnesium deposits on leaves
- 3
Maintain 50-70% RH via cool-mist humidifier running continuously within 3 feet of begonias
- 4
Pebble tray: fill shallow tray with water and stones, place pot on stones above water line for passive humidity
- 5
Water when top 1-2 inches of soil reach field capacity using room-temperature filtered water
Keep brown tips off this Begonia
Use filtered or distilled water for all watering and humidifier filling to prevent mineral salt deposition on delicate begonia leaves; maintain 50-70% RH consistently; avoid placing begonias near humidifiers using unfiltered tap water.