pjkfarm

Devil's advocate: make enclosure twice as big so root are is covered and warms up quicker - 2 feet should get most of them (4x4 rather than 3x3).
I would like to try the same on some. OR/and put down thin layer of black mulch (very thin so it does not insulate but does heat), or even some black weed mat, silt fence, etc. and keep a sharp eye out for first pups, or simply take off when weather warms up as pups for us come late here in 6b /7.