Cornwall Wildlife Trust hopes the three Oxford Sandy and Blacks will help keep bracken in check.
He told the BBC: "No other animal has the rooting behaviour of pigs.
Although poisonous to many animals, the carcinogenic materials in bracken can be broken down by pigs, he said, to prevent the plant from "dominating". Mr Collins said of the pigs: "They are a native breed so they've got all the naturalist traits which means they can deal with the rough terrain and they won't just stand at the gate looking lost."
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