'Thistles' in the Bible

By their fruit you will recognize them [that is, by their contrived doctrine and self-focus]. Do people pick grapes from thorn bushes or figs from thistles?

Other seed fell among thorns, and the thorns came up and choked it, and it yielded no grain.

but if it persistently produces thorns and thistles, it is worthless and close to being cursed, and it ends up being burned.