Citrus Root Rot on indoor citrus
What's Happening
Root rot develops when citrus roots remain in waterlogged, oxygen-deprived soil for extended periods. The anaerobic conditions promote Phytophthora and Fusarium fungal growth that destroys fine root hairs first, progressing to main roots. Container-grown citrus are especially susceptible due to limited drainage and the tendency to overwater indoor plants. Early signs include yellowing leaves, stunted growth, and leaf drop; advanced stages show branch dieback and plant death.
How to Fix It
- 1
Immediate drainage: Remove standing water; tilt pot to ensure complete drainage
- 2
Unpot and inspect: Gently remove plant; healthy roots are white/tan and firm; rotting roots are black/brown and mushy
- 3
Surgical removal: Trim all rotted roots with sterilized scissors until only firm tissue remains
- 4
Sterilization bath: Soak remaining roots in 1% hydrogen peroxide solution for 10 minutes
- 5
Repot in dry mix: Use fresh, well-draining citrus potting mix; do not water for 7-10 days
- 6
Water reduction: Resume watering only when top 2-3 inches of soil are completely dry
How to Prevent It
Use containers with multiple drainage holes; add 20% perlite to potting mix for aeration; water only when soil is dry; use terracotta pots that wick moisture; elevate pots on feet to improve drainage.