Answer: I looked at this question and was totally perplexed. Then when I was on an errand into town, it came to me! I'll bet those little "white spherical pearl-looking things" are some kind of encapsulated fertilizer. Some nursaries use this in their potted plants as a slow-release source of fertilizer. When you get them home and plant the herbs (or whatever) the pellets go with them. And as you found, they create a nice healthy environment for the plants! I wouldn't do anything! Enjoy their presence!
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