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Originally Posted by Ekka  But you cannot have one without the other correct? So in effect the callus growth carries the barrier zone ... no callus no zone.
Also that growth is altered and stronger, 40% stronger than the normal wood the tree grows. |
No Ekka, I think that's wrong.
You can have one without the other. The callus growth doesn't carry the barrier zone. You can have Wall 4, the barrier zone, without the callus.
If over the years the callus growth is very slow, then the lack of callus might mean the tree eventually loses the race, but the lack of callus doesn't mean that Wall 4 wasn't set up.
The extra strength of callus is interesting, but irrelevant in this discussion.