We've been given an ornamental pepper plant, complete with peppers on it. Capsicum NOS (not otherwise specified). the tag says "Warning. Fruit is not edible." Why not?
I imagine it would work its way out of the soil after some time but when is anybody's guess. Persistence and level of toxicity would depend on the pesticide used.
[joke]The other parts (besides fruit) are edible? Then it can't be pesticide.[/joke] I suppose that this warning is just a sign, that producer of these decorative plants doesn't comply with rules for food processing.
My initial thought was that it's a waste for an edible plant to be intentionally tainted in such a manner. However I suppose it's forgivable if it had been grown specifically for the ornamental market. Perhaps it's more expedient for the grower to apply a systemic as needed and the warning on the label is there just in case they do.