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Oh, no, it's in the soil -- the log will develop roots, just as it developed a branch.

If I hadn't planted it then the branch would have died; it was using the energy left in the log. I'm really surprised it did that! And the leaves looked so nice and crisp, too; I saw it today and it's wilting a little. I'm watering it as well, while it's getting started. Fingers crossed! :)