Saplings won't grow underground

[Smeagol]

Hello

 

I've tried to build a tree farm below ground in my sacred springs biome, but somehow the ProjectRed Exploration saplings won't grow. That is not the whole truth though since it works in a single spot (See image: http://imgur.com/xtiKuZb). I got the same height everywhere (13 blocks), i use normal dirt (fertilized dirt should work though?), but when i try to use bone meal nothing happens on all places except on the dirt patches at the bottom right in the image. I got glowstone next to each spot, so lighting shouldn't be a problem, and i don't think height should be either. The biome is the same everywhere as well. Any ideas? I'd be super thankful

 

Best regards,

Smeg

[EAS]

They need 7x7 and 14 high to grow, myself iv made 21x21 and 16 high to grow them

[Smeagol]

I got 16 high now as well, but no change, do they need dirt in their vicinity as well?

But it's strange as they grow perfectly fine in the screenshot above, and that should have the same light, same height, same pretty much everything as the other saplings..

[StratusNightstar]

For the stained saplings if you want to keep them indoors you need to have an opening all the way up above that sapling. No blocks between that sapling and the sky.

[Smeagol]

Well, in that case, none of the saplings would grow.. and not to be a fanboy, but BdoubleO has done something very similiar and that's underground and working afaik

[StratusNightstar]

Guess what not too long after that episode he no longer has stained saplings in that room. I'm just letting you know how I got it to work. I went and did a room like his a couple weeks after that episode and that's when I realized the issue and figured out a way around it. Take it or leave it.

[Smeagol]

Allright, thanks anyways then, might turn it into a crop farm instead then Still, it annoys me that the one place works..

[DanielUSA]

Try using inverted sky  blocks or sky blocks. I know I have grown colored saplings under ground and the grow room was literally encased in this stuff.

Edited July 13, 2014 by DanielUSA

[Smeagol]

ah, nice idea! ill give that a go

[Smeagol]

no dice, worth a try though

[arriej]

try to place some more light around next to the sapling