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Thorns are a form of protection against predation and are costly to the trees energy supply. Should the tree not need them then why make them? By way of example you may notice in your travels that some Holly trees have hardly any spiky leaves unlike those in the New Forest where the ponies eat them to de-worm themselves which are prickly beyond comprehension - ouch! Trees are VERY clever and we sometimes don't appreciate that very much.

 

 

 

i have just been educated :)

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