Posted by Gus on 2/6/2008, 12:14 am, in reply to "Eucalyptus regnans not hardy but ...."
Link: EUCALYPTOLOGICS: Resprouting from base of the trunk without lignotuber
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Hey Larry, thanks for sharing that growing experience! 
In provenance trials done at NZ it was found there is up to 4F of difference for cold hardiness between different seed provenances. In my opinion the chances of finding E. regnans that take 10F well are low. 15F is more reliable, and also matches well with your results! Still, duration of the frost event matters quite a bit.
A small point on resprouting. Eucalyptus without a lignotuber can resprout. But for this to happen, there has to be some undamaged "dormant" bud at some point of the lower trunk. They have a pair of these in each internode, first in the axil of leaves (when the plant is young) and later in the axils of branches (when they are older). If some of these is safe after aerial part damage (by fire, frost, browsing or harvest), it can resprout. But their numbers are always lower than those that can develop in lignotubers (which can be hundreds), so chances are higher for those species having it. You have an example of no lignotuber species resprouting in the link below
So, totally toast plants down to soil level or root collar do not resprout because all the dormant buds got killed. Same could happen if, for instance, the lignotuber was well above the soil and got toast too
Still, these plants are stubborn. I have made some trials burying the whole lignotuber in young plants half a foot under substrate and removing the aerial part at soil level. Then, washing off the substrate after a time. There were numerous new shoots that had grown with no light under the soil!! But, in absence of light, they were totally white and did not manage to break through the substrate before finishing off all the reserves.
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