Environment
Low humidity
Tropical houseplants evolved in humid conditions, and dry indoor air, especially during heating season, causes crispy brown tips and edges that won't turn green again.
How to confirm it
- Check whether the browning is worse in winter or right after the heat or AC kicked on for the season.
- Rule out fertilizer buildup first by checking for a white crust on the soil surface or pot rim.
- Compare the plant's native humidity needs to the room it's actually in.
Next Steps
Fixes connected to this cause
Increase humidity
A small humidifier near the plant does more for crispy tips than misting, since misting evaporates within minutes.