I think in the wild they can dig down pretty deep in order to find a stable temp through the winter, probably below the frost level they also vary the depth according to the soil temp. In a garden I doubt this would be possible unless you have a couple of foot of diggable soil, you'd also need a well sheltered garden and one that doesn't flood, to be honest its not a risk I'd take. I did try using the gh for my adult Ibera to hibernate in once but it didn't work, despite it having a soil base and a depth of a couple of foot we found that the weather was to unpredictable. When the sun came out they obviously felt the heat and would come to the surface only to be caught out when it got cold again we were constantly burying cold torts and gave up in the end and boxed them as normal. I think our winters are to varying and we might have long spells of either to warm/wet or cold but not enough consistantly cold at least thats what I think. A controled enviroment hibernation is far safer.
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