[eeyore]

Originally Posted by rangersarah2

Flippin' 'eck Lori, how do you remember stuff like that?

I do know that the cambium layer is completely gone with the ring-barking, so suppose it must be root grafting. Can't really get my head around how the crown keeps flourishing though.

Any explanation or other ideas welcomed.

i think some trees have a sort of secondary cambium layer further into the trunk - also the primary cambium can heal itself.

my advice just fell the blighters and treat the stumps with roundup and wettable b - the deadwood habitat on the floor will be nearly as valuable as the standing deadwood - assuming of course that you dont choose to extract the timber for firewood or crafts