are they really bog plants?
I want to grow petasites, gunnera, and astilboides. Oklahoma soil is mostly clay, though amendable. My back yard is filtered sun to shady in spots, but dry shade. I do grow plants that need a lot of water, such as hostas, astilbes, arasaema, ferns, acanthis mollis, begonia grandis, goats beard, and so on and so forth.
Is it possible to grow these large plants mentioned above, in regular soil, if watered frequently and thoroughly? If not, what do you think about sinking a small plastic child's swimming pool in the soil, with drainage holes, filling it with amended soil (manure, compost, peat moss), to creat a bog garden?