Why do some propagated succulent leaves rot?

Written by
Paul Reynolds
Reviewed by
Prof. Martin Thorne, Ph.D.Rot is the enemy of propagation with succulent leaves. Rot often develops from excessive moisture, inadequate airflow, or contaminated environments. I have saved many propagations by catching them early. You can do the same when you know the root causes and avoid them in the first place!
Moisture Management
- Mist soil only when surface dries completely
- Use spray bottles with narrow streams
- Never wet leaves directly during watering
Soil Composition
- Create gritty mix with 40-50% perlite
- Ensure containers have drainage holes
- Replace soil every propagation cycle
Airflow Optimization
- Space leaves at least 1 inch apart
- Use open trays instead of enclosed domes
- Position near gentle air circulation
Contaminated tools provide invisible pathogens. Always ensure that you sterilize any tweezers and trays with isopropyl alcohol before use. I disinfect my propagation kit at least every month. Your precaution will prevent pathogen transfer that creates a black spot. Also, avoid reusing any soil that was used in a failed batch of cuttings.
Weather conditions also significantly impact rot threat levels. High humidity levels (i.e., greater than 70%) require longer callousing times. In the rainy season, I actually use dehumidifiers in my propagation area. Your climate mods also help reduce leaf moisture. You can track with basic hygrometer devices.
Rescue partially decayed leaves right away. Use sterilized scissors to prune any damaged sections. Apply cinnamon powder to the wounds, which will work as a natural fungicide. I have saved 60 % of the affected leaves using this method. The sooner you act, the less value you lose!
Prevention is always better than treatment. Maintain a consistent routine for the big steps, from leaf selection to transplanting. I keep propagation journals for my odds of success. Diligence will create a system they are rot-resistant. Enjoy your healthy succulents grown from healthy leaves.
Read the full article: How to Grow Succulents From Leaves Successfully