Clones enjoy almost 100% humidity during the first few days after sticking, but pay close attention to temperature.
Cool temps and high humidity can encourage mold growth on the stems and leaves, just like in this photo.
Aim for 75-80 degrees Fahrenheit, and if you’re using humidity domes, make sure to introduce fresh air throughout the cloning process. Try this technique:
- After two days, open the vents on top of the plastic dome.
- After three days, place the dome at an angle on top of the tray to allow for increased airflow.
- After four days, remove the dome for short periods of time throughout the day (1-2 hours).
- Repeat the previous step until day seven.
- After seven days, remove the dome completely.
- Saturate the substrate in the propagation tray with a dilute mix of nutrient solution and purified water at a strength of 0.5 EC and a pH of 5.5 to 6.2.
- After two or three weeks, the clones will have rooted and will be ready to be transplanted.
Cloning involves finding the perfect balance between humidity and temperature. Once you find that sweet spot, you should realize an 80-90% rooting success rate.