The way this mod works is based on a group of blocks called “Growth Blocks.” They are this mod’s equivalent to saplings. Like saplings, growth blocks will randomly update, generating new blocks.
Minecraft Treevamped will eventually drastically change the trees in Minecraft. I think it is a great concept because, although it is complicated, it is quite simple for what it would allow for. You can make almost any kind of tree almost any size! To learn more about this concept, visit this page.