Long blank white

its not a normal tree, so it has special spawning so it can be in the water i think

Once I saw a birch tree grow on another tree

It's a mangrove tree which are found IN mangrove SWAMP biomes. That's how

It’s a azalea tree you retard

Ooo, an azalea tree!
If you dig under it, you'll find a lush cave!

Seen it in a desert before,l. Just in the middle of a river

theres a chance that a lush cave is under that tree

You can also grown azalea trees underwater, same with mangrove