The tree predated World War One, a spokesperson said.
“As the sculpture ages, the wood will fade to a lighter, more silvery tone which reflects what happens to vixens’ fur after they have become mothers,” they said.
The sculpture is accompanied by a collection of Heligan-inspired poetry from poet laureate Simon Armitage, with both works “highlighting and celebrating the wildlife who make Heligan their home”, Heligan said.
Ms Hill said Armitage’s poem, Den, “speaks so powerfully of the wild, feral nature of foxes”.
She said a photograph of a pouncing fox taken on the Heligan estate by Andy Wilson was the artists’ “core inspiration”.
“Lowarnes has her gaze set on you as her prey,” she added.