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

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 period.

The judge cited her difficult conditions in custody, including being in solitary confinement for at least 22 hours a day, as part of his reasons for giving her a chance at parole.

The Victorian Director of Public Prosecutions on Monday evening confirmed it would appeal Patterson's sentence.

"We confirm that a DPP appeal has been

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