Eli5: why overwatering plants can cause roots to rot, but growing plants in just water dont?
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So not all plants can grow in with their roots submerged in water. Many will just die.
That being said, for those plants that CAN grow in water or soil, care needs to be taken. Although roots look the same to our eyes, roots that are grown in water and grown in soil are different, and if you take a plant that was grown in water and put it into soil it very well can kill the plant. You need to transition the plant properly from one to the other.
Second, you might think that something like hydroponics just means growing food in water, but it is actually a little more complicated than that. Typically hydroponic and aquaponic systems have water levels that cycle up and down. So a plants roots will be submerged for awhile, then the water will drain and the roots will be in air (or the media), and then they will get submerged again.
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