And underground tree farm? Yeah, I can see me doing it if I could.But of all things, why a tree underground?
As of 18.3, skylights still worked. A tunnel to the surface, which can still be covered up iron bars at the surface level (glass would probably also work), will provide light to the underground farm, directly on that square and radiating out around from that square for at least 3 more squares in all directions.Last time I checked (back in Alpha 10 or something), you just needed skylights and enough space for plants to grow. So, if you have the height and width and a skylight near it, theoretically, it might still grow. But of all things, why a tree underground?
Wait a minute, you're saying just light... did you change it again to allow torch / flood lights to work again?A seed block will not place if there is insufficient light or ground fertility so I doubt that this will be a problem. =)
As far as I know and have observed, there is only one growing speed. Growth is all or nothing.So, if I plant the seed under the ceiling without straight lighting by the sunlight, would it grow slower?
────────── <<< ceiling
○ ○ ○ ○ ○ <<<plant
口口 口 口口 <<<farmland