Jennie,

If you dig up your mint and pull young stolons from the outside of the root and re plant them in fresh soil they should be OK. I always grow mine in pots sunk in the ground to stop them making a take over bid. This year I am not going to sink the pots to give me a bit more room. Even if the pots are sunk in the ground they need watering as if they weren't.

Hope you have better luck this year

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Gardening requires a lot of water - most of it in the form of perspiration. Lou Erickson, critic and poet