Answer: It is possible to contain the roots of the elephant ears by placing a barrier in the soil. I would vote for lining the entire planting bed with hardware cloth rather than trying to plant them in a child's wading pool. Most pools won't be deep enough to accommodate the roots (12-18"). If you can find one deep enough, you can use it, providing you drill lots and lots of drainage holes (1/2 inch holes every 8-10 inches) on both the bottom and the sides. You'll want to fill it with a 50/50 mixture of garden soil and potting soil so it will retain moisture. While I appreciate your idea of planting them in a bog, if the water does not have a chance to drain out and be replaced with fresh water, it will not have enough oxygen in it to support healthy root growth. So, the pool will help keep the soil moist but not soggy or boggy. The elephant's ears will be happy with the mixture of garden soil and potting soil. You can dig and transplant them now. They will go into transplant shock and look pitiful until the first frost (when the leaves will die back), but the the roots should be just fine and should produce healthy new leaves next spring.
Good luck with your project!
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