Blake Lenoir wrote:Could we use repellents (natural ones) to stop rodents from entering in the mound beds?
I'd make stacks of rocks around the berms to attract snakes.
Blake Lenoir wrote:Also, how we keep our beds safe from being frozen to keep our soil enriched and fertile?
Not sure where you live but I'm in Colorado and it gets down to -15F sometimes. I usually add a good 3" or so layer of mulch, humus or leaves before the freeze, or cover crop them. Most of my berms are roughly 3' deep and 3' high, so about 6' total to the bottom of the trench to the very top. It will freeze but the core should be good. I've never ran into issues during the winter with my hugel berms. I also have poly pipe running down to the bottom of the trench and usually dump water into them once a year before the deep freeze just to make sure they are moist but that's not really necessary.
I'd also suggest adding spent mushroom spawn blocks if you can source them from a vendor. They often toss them out for free when they are done with them and they make a great soil amendment or can work as mulch. They still will contain mycelium and promote fungal growth.