I built my first hugelkultur bed this year with a good quantity of well rotted logs that were placed in a shallow trench. The soil I placed on top was a mixture of clay subsoil and
compost. It turns out the compost material was not fully finished and is showing temperatures that indicate it is still active. The interesting part of this is two fold:
1) The active compost is creating ideal situation for seed germination.
2) This compost pile lost heat during the winter and some of the kitchen scraps I added to this were not cooked down, so I have about 20 winter squash seedlings germinating. Perhaps (in my cool temperate climate), this would give us a jump on the season so to speak. Long season crops like winter squash can be challenging to germinate in our cool springs, this bottom heat overrides this issue.
I thought this might be of interest to a few.