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Growing invasive/bog plants in a tub

Heruga (6b/7a NJ)
January 16, 2017

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?

Comment (1)

  • Irving Ragweed (Austin 8b)

    When you repot a plant grown in a container that drains, the potting soil usually drains fast enough to meet the plant's requirements, so you're rarely working with mud. If you grow bog plants in a non-draining tub, the medium is perpetually water-logged to keep the bog plants happy. Digging in/repotting from muck that sticks to your tools and gloves is not a project any sane gardener wants to tackle.

    The solution is to start with a potting medium that best suits your bog plant(s). Depending on the species you grow, replenish the bog soil with top-dressings of organic matter and slow-release (organic) fertilizer.

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