Posted February 25, 2011
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Trees don't respawn automatically, to the best of my knowledge, but you can replant them. If you harvest all the wood blocks from a tree, the leaves will start to die on their own. As they do this, they drop saplings, which you can use to plant new trees. The leaves will occasionally drop saplings if you simply destroy them, but not as often as when they're allowed to deteriorate on their own. However, even if you destroy them yourself, you should get more than one sapling per tree, so replanting shouldn't be a problem either way.
Edit: Double ninja'd.
Post edited February 25, 2011 by Wishbone