Edema on rubber plant
What's Happening
Squidgy, water-soaked brown patches on Ficus elastica leaves indicate cellular edema—ruptured cells from excessive water uptake when roots absorb faster than leaves can transpire. Unlike crispy sunburn or fungal spots, edema feels soft and slightly sunken. Occurs when soil remains moist during low-light periods (winter, cloudy days) or after repotting when root uptake is impaired. High humidity reduces transpiration, exacerbating the condition.
How to Fix It
- 1
Cease all watering immediately—allow soil to dry completely
- 2
Increase air circulation with small fan to accelerate transpiration
- 3
Move to brighter location to increase photosynthetic water demand
- 4
Do NOT remove affected leaves unless spreading—plant will reabsorb excess water
- 5
Repot only if soil is staying wet beyond 2 weeks; use airier mix with extra perlite
What You'll Need
How to Prevent It
Reduce watering frequency by 50% during winter or low-light periods. Never water immediately after repotting—wait 7-10 days. Maintain moderate humidity (40-60%) rather than excessive moisture.