Edema on anthurium
What's Happening
Edema in Anthurium occurs when root uptake of water exceeds leaf transpiration capacity, causing cells to burst and create blister-like brown spots. This happens when plants are watered heavily during low-light periods or when high humidity reduces transpiration. The thin, velutinous leaf cells of Anthurium andraeanum are particularly vulnerable to rupture from internal water pressure compared to thicker-leaved tropical plants.
How to Fix It
- 1
Identify edema: Blister-like or water-soaked brown spots, often on leaf undersides or margins, distinct from circular lens burn
- 2
Immediate action: Stop watering for 7-10 days to allow plant to process excess moisture
- 3
Increase transpiration: Move to slightly brighter location or add gentle air circulation with fan
- 4
Reduce humidity temporarily: If above 75%, lower to 60-65% for 1-2 weeks to encourage leaf drying
- 5
Long-term fix: Adjust watering schedule to morning only; reduce volume in low-light conditions
What You'll Need
How to Prevent It
Water only in morning hours when transpiration is active; reduce watering frequency during winter low-light months; maintain 60-70% humidity (not excessive 80%+); ensure good air circulation to promote transpiration; allow soil to dry 2-3 inches between waterings.