grafted plants

somebody -sorry didn't notice exactly who - bemoaned the loss of a Corymbia ficifolia sapling in unprecedented cold. Having lost several to frost, although they are street trees in nearby Ballarat, which is renowned for its cold, I reluctantly paid a great deal for a grafted specimen that I intended to keep in a pot. However, in the way of these things, it was planted by my spouse and has survived frosts which burnt off other, supposedly, hardier plants. As it is the roots that are not C.ficifolia, does anyone have an explanation for the apparently improved hardiness of the grafted plant?
 
M.Healey
 
PS. appologies to New Zealanders for the smoke, and thanks for the firefighters. Also thanks to Canadians and Californians, or is it Coloradoes or both for fire fighters.
Two million acres so far up in smoke and yet another 'horror' weekend in sight.
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