Crown Rot From Exposed Stem Neck on african violet
What's Happening
African violets have a distinct crown structure where all leaves emerge from a central growing point. When the stem elongates over time (a natural aging process called "necking"), the crown rises above the soil line, exposing it to moisture fluctuations and creating a vulnerable zone where water can pool during watering. This exposed crown tissue is more susceptible to rot than crown tissue protected by soil. The combination of exposed crown, water splash during top-watering, and accumulated salts from hard water creates ideal conditions for bacterial soft rot.
How to Fix It
- 1
Inspect crown height: measure from soil line to base of lowest leaves - should be less than 1/2 inch exposed
- 2
For moderate necking (1-2 inches): carefully scrape papery outer layer from elongated stem, then repot 1/2 inch deeper in fresh mix
- 3
For severe necking (2+ inches) or if crown shows any softness: propagate from healthy outer leaves rather than attempting to save main plant
- 4
Repotting technique: remove lowest 1-2 rings of leaves, plant so remaining leaves sit just above soil surface
- 5
Water temperature: always use room-temperature water (65-75°F); cold water causes cellular shock and increases rot susceptibility
- 6
Salt flush: monthly, water from top until water runs from drainage holes to leach accumulated minerals - blot crown dry immediately after
How to Prevent It
Repot annually to maintain crown at proper soil level. When neck elongation exceeds 1 inch, either replant deeper (burying the elongated portion) or restart from leaf cuttings. Use room-temperature filtered water to prevent cold shock and mineral buildup. Apply water only to soil, never allowing splash onto the crown.