Plants “breathe” through roots (their leafs are for photosynthesis), so if the soil is so waterlogged that air can’t get to the roots, they “drown”. Cut plants in water are on “life support”. Think of a person who is only surviving because of an IV. After a time, the lack of necessary nutrients and such will still kill them because not everything can be supplied intravenously. That’s why plants that can will start to grow roots, in an attempt to draw in the missing nutrients. But even then, they will eventually drown if not move to proper soil.
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