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I'm attempting to grow trees underground in mass production for charcoal.
and though i've seen success stories it hasn't worked for me yet.
saplings are on dirt, have torches directly next to them, and have 5 to 6 blocks cleared above them
an entire (real) day has passed and nothing, multiplayer server no mods.
any suggestions?

Try using bonemeal, it can be used as fertilizer and will cause crops and tress to grow instantly.

Try using glass roofs. Torches are technically enough light for trees to grow but for whatever reason I've found that sunlight will cause them to grow faster when they're underground. Also, maybe you could try doing a partially-open tree tower, with multiple levels stacked up. This works to get effect for me and it's monster-free if you light it up well.

Do you have water near the trees? ive heard water makes it grow 4 times as fast.

Quote from Lil_Lito8 »

Do you have water near the trees? ive heard water makes it grow 4 times as fast.

That's crops, not trees.

I've always used a 6x1 tube thing in the wall to grow my trees in, butI recently went to 7x1 & I noticed that I get one extra log EVERY time. As for them not growing, bonemeal would be a waste unless you KNOW that they can grow there, (it uses it whether it grows or not) but there could also be a glitch with multiplayer.