Tree in Mangrove swamp. Doing just fine in submerged water. The white cedar, eastern hemlock, loblolly pine, black spruce, red maple, elm, pin oak, and birch also live in that swamp, in watery conditions. (Trees like water you know.)
Trees like SOME water. Not being submerged in it for ridiculous amounts of time. Floods, even normal, every day floods, can be devastating to plant life.
Trees also like sunlight. Which you don't get under miles of water. Light can only penetrate, about, 200 meters in water, then it gets cut off. There's a reason you don't find any plants below a certain area in the ocean.
Also, there's this thing called water pressure.
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