Just watched the third video, and wanted to clear some things up about BoP redwood saplings. I just got curious about them one day and ran some tests so uh
That thing about them needing to be 6 blocks away from other redwoods isn't entirely correct (I don't remember the exact number either, but it was between 5 and 9). You can have any amount of redwood logs nearby, but anything else will prevent the tree from growing - even torches, tall grass, more redwood saplings, snow or other transparent blocks. In fact, you only need one sapling for the whole tree to grow, that was changed in a somewhat recent version. I don't recall running into any issues with (Natura cloud) blocks above them, but I don't recall testing that much either... and lastly, all eight blocks around the sapling need to be grass blocks, it doesn't like dirt.
That thing about them needing to be 6 blocks away from other redwoods isn't entirely correct (I don't remember the exact number either, but it was between 5 and 9). You can have any amount of redwood logs nearby, but anything else will prevent the tree from growing - even torches, tall grass, more redwood saplings, snow or other transparent blocks. In fact, you only need one sapling for the whole tree to grow, that was changed in a somewhat recent version. I don't recall running into any issues with (Natura cloud) blocks above them, but I don't recall testing that much either... and lastly, all eight blocks around the sapling need to be grass blocks, it doesn't like dirt.