Can trees grow without sunlight?

I've built an underground forest chamber in my main fort as a convenient lumber supply. It has a dirt floor and plenty of torches, but the trees I planted there haven't sprouted yet. I have heard that wheat will grow under torchlight (I believe X's Adventures in Minecraft mentioned this). Do trees also share this property?

Solution 1:

Trees can definitely be grown underground with sufficient light. According to this thread on the Minecraft Forums, you need 7 blocks of space above the sapling. (Perhaps this condition isn't being satisfied.)

Solution 2:

7 blocks of height is required.

A neat trick is to put stone next to the saplings, so you don't have tons of leaves that you have to deal with.

from above, this is what I do:

XXXXXXXX
SXSXSXSX

XSXSXSXS
XXXXXXXX

S <- Sapling X <- Rock

Note, the Sapling has to be planted in dirt. Put torches on the rock pillars to light the saplings,and you are good to go!

Solution 3:

Any light will work for trees. However, you may need more space.

My underground (automatic >:D) tree farm is 200x200, for the trees at least, and I've found trees require at least 1 block on all sides, and at least 7 blocks up. I have it at 10 right now, but to get the bigger trees you'll have to expand it to around 20-30. To get large jungle trees, you need around 60 blocks space, and yes, I have done this before.