Just for grins I may stick my compost thermometer (has long stem) in the ground both in raised beds and flat earth. I need to make a schedule so I won't forget and maybe get D to measure while I am gone in April. Interesting experiment. I have been wary of planting spuds from store bought potatoes. Have read that they can be 1) sterile 2) peetered out and not able to produce the original potato