I made a small batch of "super"soil. It's my first try with it. The recipe calls for letting the soil "cook" for 4-6 weeks after mixing and watering before use. It's not for seedlings. It's too hot. It say to transplant established plants and only give water. People said they got temps of 120 degrees when cooking. My small batch never really got hot. It heated up a bit But never over 90. I'm not trying to kill off any seeds or anything. I just want the organic material to breakdown so nutrients become available. It has been about 4 weeks Since mixing my soil. Turned it a few times.
Here's the roots of one.