Prosecutors have confirmed an appeal to the "inadequate" 33-year sentence handed to Erin Patterson. Photo: Anita Lester/AAP PHOTOS

Prosecutors have confirmed they will appeal mushroom murderer Erin Patterson's prison sentence, claiming it is manifestly inadequate.

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Patterson, 51, was in September jailed for life for killing three of her lunch guests by serving them a meal laced with death cap mushrooms.

Prosecutors were pushing for a prison sentence of life without parole but Victorian Supreme Court Justice Christopher Beale showed Patterson mercy by giving her a 33-year non-parole

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