Which Gunnera are you going for? I wish there was a medium-sized one! I have tried the small ones (G. magellanica) but so far no luck keeping them - might have been the Beasts that did for them.
They look very nice. Are you just hoping to have to water less if you move them out of the pots? There is a danger that they'll get a lot bigger if they like the ground, but as @nutcutlet said they do need a damp soil, perhaps even wet - wherever I've seen them in gardens, e.g. Rosemoor, they've been in boggy areas.
I would like one to sit right next to the pond without being in a pot and yes hopefully less watering. The pond has been raised up about a foot so technically the plant will be in a raised bed. I am just afraid that it will damage my pond due to its roots. I don’t mind the leaves being a bit bigger.
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In the sticks near Peterborough
In the sticks near Peterborough