summer rot on Sedum
Quick answer
If your Sedum has summer rot, the most likely cause is: Sedum varieties like Sedum dasyphyllum and Sedum spathulifolium are highly vulnerable to summer rot when grown in poorly ventilated conditions with excessive moisture. The densely clustering leaf structure traps humidity, creating micro-environments where Pythium and Rhizoctonia proliferate.
Start here:
- 1. 1. Remove any visibly rotting stems immediately — cut at least 1 inch into healthy tissue
- 2. 2. Allow cut surfaces to air-dry for 24 hours before potting in fresh dry succulent mix
Why Sedum gets summer rot
Sedum spp.
Sedum varieties like Sedum dasyphyllum and Sedum spathulifolium are highly vulnerable to summer rot when grown in poorly ventilated conditions with excessive moisture. The densely clustering leaf structure traps humidity, creating micro-environments where Pythium and Rhizoctonia proliferate.
How to reverse summer rot on Sedum
- 1
1. Remove any visibly rotting stems immediately — cut at least 1 inch into healthy tissue
- 2
2. Allow cut surfaces to air-dry for 24 hours before potting in fresh dry succulent mix
- 3
3. Do not water for 7-10 days after repotting to allow roots to establish
- 4
4. Improve growing conditions: move to more ventilated location, reduce watering frequency
- 5
5. Drastically cut back leggy or moldering stock — Sedum regenerates readily from fall cuttings
Keep summer rot off this Sedum
Ensure excellent air circulation around Sedum plants, especially in summer. Water only when soil is bone dry. Position in well-ventilated outdoor locations. For cascading varieties, avoid grouping with other plants that restrict airflow.