Brown Spots on anthurium
What's Happening
Water droplets on Anthurium leaves act as magnifying lenses when exposed to direct or intense light, causing localized thermal damage that appears as circular or irregular brown spots. Anthurium andraeanum leaves have thin, velutinous (velvety) texture that lacks the structural resilience of succulent leaves, making them particularly vulnerable to photo-thermal injury. This occurs when watering coincides with peak light hours or when leaves remain wet during bright conditions.
How to Fix It
- 1
Inspect spots: Circular/irregular brown marks in leaf centers indicate lens burn; edges or fungal fuzz indicate other issues
- 2
Relocate immediately: Move plant to bright indirect light (east-facing window ideal)
- 3
Switch watering method: Bottom-water only or water at soil level early morning
- 4
Increase air circulation: Small fan to speed leaf drying if accidental wetting occurs
- 5
Trim affected tissue: Use sterile scissors to remove brown spots to prevent secondary infection
How to Prevent It
Water only in morning hours (before 9 AM) to allow complete leaf drying before peak light; use bottom-watering methods to avoid leaf wetting; maintain 60-80% humidity via pebble trays or humidifiers rather than misting; position plants 3-5 feet from south/west windows with sheer curtains to filter intense light.