I am surprised that no one talked about this yet. when you plant a sapling, it checks for blocks around it, like how you can't have it grow if there's a grass block near it. however, this doesn't happen with tall grass and other trees. normal. But if you have 2 block tall grass/fern near it, it will stay in sapling form, even with randomTickSpeed put to a high number, as shown in the screenshot. It is very annoying and would help building/terraforming to be faster if you changed that. Thank you in advance, you do a great job and we can't thank you enough. well Jimmy doesn't thank you, but he probably forgets. have a good day and nice holidays.