>> Mint is supposed to be very hardy, although our mint plant died last year.

Mint is best grown in a pot. If one plants them in the ground take a five
gallon bucket and cut the bottom out and bury it in the ground to help
prevent it from spreading. Mint is like a weed, it will spread and will be
very difficult to eradicate. I do like the smell of mint and is best to
have the plants next to windows or the deck where one sits outside.

I bought one plant and it took four years to eradicate the plant from the
yard.

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Enjoy Life... Nad R (Garden in zone 5a Michigan)