Root Rot on african violet
What's Happening
African violet (Saintpaulia ionantha) root rot develops when fine, hair-like roots remain in saturated soil for 5-7+ days, creating anaerobic conditions below 2mg/L dissolved oxygen. The shallow, succulent root system evolved for epiphytic conditions in Tanzanian cloud forests where water drains rapidly. When potted in moisture-retentive mix or overwatered, Pythium and Phytophthora pathogens proliferate, destroying root hairs first, then progressing to the crown. Crown lifting (plant rising from soil) indicates collapsed root structure unable to anchor the plant. Dickeya chrysanthemi bacterial soft rot can also colonize compromised tissue, producing characteristic mushy black roots without foul odor in early stages.
How to Fix It
- 1
Unpot immediately: Gently remove from container and rinse all soil from roots under lukewarm water
- 2
Inspect and trim: Use sterilized scissors to cut away ALL mushy, black, or translucent roots - healthy tissue is white and firm
- 3
Sterilize: Soak remaining roots in 3% hydrogen peroxide solution (1:1 with water) for 15-20 minutes to oxygenate and kill pathogens
- 4
Callus period: Lay plant on dry paper towel in shade for 24-48 hours to seal cut surfaces
- 5
Repot in dry mix: Use fresh African violet mix (50% peat, 25% perlite, 25% vermiculite) - soil must be completely dry
- 6
Water after 1 week: Resume bottom-watering only when top 1 inch of soil is dry
How to Prevent It
Bottom-water exclusively to prevent crown wetting; use shallow pots only 1/3 larger than root ball; allow top 1-2 inches to dry completely between waterings; maintain 50-60% humidity via pebble trays rather than misting; repot annually in spring using fresh sterile mix.