Yeah, so there was, I guess is, a bug in the current version of the game where trees would grow to full after a patch. You have to dig them up with a shovel. They are technically still seeds but the animation is messed up. I believe I’ve fixed this for the patch tomorrow. As for the tree that isn’t growing, there is a mechanic where trees will not grow if they are within 2 tiles of another tree in any direction.
The afore mentioned bug where trees would grow instantly after a patch ignores this 2 tile rule, but like I said that should be gone tomorrow.