Prosecutors say the Victorian judge who allowed convicted mushroom murderer Erin Patterson a chance at parole wrongly believed she would remain in "solitary confinement for years to come".

Supreme Court Justice Christopher Beale cited Patterson's harsh prison conditions in a maximum-security cell for at least 22 hours a day as a key reason for setting a non-parole period when he sentenced her to life in prison last month.

Crucially, that decision allows Patterson to apply for release on parole after 33 years .

The earliest Patterson could be freed is in 2056, when she will be 82.

Prosecutors had argued against any prospect of parole, arguing the premeditated murders of Heather Wilkinson and Don and Gail Patterson, and the attempted murder of Ian Wilkinson, was in the worst category o

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