Maybe they'll get all sentient and come after people, like in The Day of the Triffids. Can't remember if that was aliens landing or like, alien shit making plants come alive, but they went after the vulnerable, so either way they were pretty brutal. Gotta respect a practical plant.

( Though she pauses.... Dramatically. ) Maybe they'll come after us through our weaknesses. Destroy America by taking apart the vineyards and sugar cane.