Answer: I understand your concern but I don't think that any worms in the potting soil will migrate into your house. Worms like cool, moist places like potting soil. As for where they came from, packaged potting soil is pasteurized so unless the package had holes or other breaks in the plastic, I don't think the worms came from the potting soil. They may have been living in the rootball of your plants, though. When plants are potted up in nurseries, the potting soil most likely is produced right on site. It is possible the worms were in the original potting mix and made comfortable homes near the roots of your palms. They will stay in that environment for as long as it suits them. I don't really see a problem with having them there. Their jobs are to consume the organic matter in the soil and turn it into rich "castings" which will benefit your plants. I'd just leave them alone.
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