I have not tried putting them in the ground here. I find they tend to rot when covered over with material, so I wouldn't have thought to mulch them for the winter, though I wouldn't be surprised if they endure better covered in the cold than in warmer times. With winter being my best growing time (under plastic) I also hadn't thought to try letting them go dormant in the cold. I'll have to dig up those videos you're referring to.
