Trees won't grow in minecraft FTB

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I have created a 2x2 spruce tree farm in Feed The Beast and the trees won't grow at all. I have tried giving the saplings bonemeal and other things I found on the internet, but they still will not grow. Here's a picture of my tree farm:
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Why are my trees not growing with bonemeal Minecraft?
Most trees in Minecraft will not grow when there is a block next to them. This can be something as small as a torch. You'll need to make your room larger.How do you force a tree to grow in Minecraft?
The height and general configuration of the tree will change depending on the available space above the sapling. Oak saplings can sometimes grow into much larger trees and require a 3x3 column of space above it with at least 5 spaces above in order for it to grow successfully.Chainsaw and tree epic wins - Awesome people WIN compilation
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Antony Trivet, Antony Trivet, Antony Trivet, Antony Trivet