Hi Remis,
this was one year old plant.
The other one similar to this is santa cruz dark but its lower trunk looks much better although the limbs also are dead, the brother to it another santa cruz dark is fine all stored next to each other with blue tarp hung down from wall for wind protection when door opens , all other trees were not protected.
Also for an idea i never heat my garage but thats just me, im betting the ronde would have had some limb damage but nothing like this and i think the very deep cracked limb at soil level had something to do with it. My much smaller 1 year olds some a foot tall had no damage which im happy to say because some of these are hard to replace such as the ronde if i dont get a shoot growing on it. I did cut up that cracked limb and saved a piece to propagate but i have my doubts as it also was very dried out but i have no choice other than that trunk opening one bud or a sucker. Time will tell shortly.