root rot on Houseplant
Quick answer
If your Houseplant has root rot, the most likely cause is: Root rot in houseplants is caused by waterlogged soil creating anaerobic conditions that favor Pythium and Fusarium pathogens. These oomycete and fungal pathogens thrive when soil pores are saturated, displacing oxygen needed for root respiration. The pathogens invade damaged root tissue, breaking down cell walls with endoenzymes, causing the classic black, mushy root symptoms. Pythium produces zoospores that swim through water-saturated soil to reach healthy roots.
Start here:
- 1. Remove plant from pot and rinse roots under lukewarm water
- 2. Trim all black/mushy roots with sterilized scissors, cutting 1/4 inch into healthy tissue
Why Houseplant gets root rot
Root rot in houseplants is caused by waterlogged soil creating anaerobic conditions that favor Pythium and Fusarium pathogens. These oomycete and fungal pathogens thrive when soil pores are saturated, displacing oxygen needed for root respiration. The pathogens invade damaged root tissue, breaking down cell walls with endoenzymes, causing the classic black, mushy root symptoms. Pythium produces zoospores that swim through water-saturated soil to reach healthy roots.
How to reverse root rot on Houseplant
- 1
Remove plant from pot and rinse roots under lukewarm water
- 2
Trim all black/mushy roots with sterilized scissors, cutting 1/4 inch into healthy tissue
- 3
Disinfect remaining roots with diluted hydrogen peroxide (1:4 water) for 30 seconds
- 4
Repot in fresh chunky aroid mix; ensure pot has clear drainage
- 5
Water sparingly post-repot — wait 5-7 days before first watering
- 6
Place in bright indirect light and maintain 60-80% RH to reduce recovery stress
Keep root rot off this Houseplant
Water only when top 1-2 inches of soil reach field capacity. Use well-draining aroid mix with 40%+ perlite. Ensure pots have unobstructed drainage holes. Never let pots sit in standing water for more than 15 minutes. Maintain soil temperature above 60°F to prevent pathogen proliferation.