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Growing invasive/bog plants in a tub

I want to know how this exactly works. So for example if you want to grow petasites japonicus in a tub sunken to the ground, to control their invasiveness and to retain moisture for these boggy plants, do you just add regular native soil in the tub or topsoil? Also, do you have to periodically change the soil as well or can it stay in there for forever? I'm wondering because when you grow plants in a pot, you have to change the potting mix every couple years. Does the same apply for soil in a tub?

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