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?
Minecraft Java Edition – Can Trees Grow Without Sunlight?
minecraft-java-edition
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Best Answer
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.)