@Nindigo Sorry for the digression.
To return to your topic...no, I've never had a sim remove a wild plant autonomously.
I have had sims remove wild plants
deliberately. That was a tip from Playalot about a year or so ago, to try and force a certain type of (missing) Granite Falls herb to grow.
Once it's removed, I don't think it grows back. Could Caleb "place in world" another Sixam Mosquito Plant seed in the same general area?
Caleb, you are acting very oddly!