“The Herb Garden Germination” is the twentieth episode of the fourth season of the American sitcom The Big Bang Theory. This episode first aired on Thursday, April 7, 2011. This is the episode where rumors about Bernadette’s intention of breaking up with Howard start spreading among their social group. However, Howard, who was left in the dark, is thinking of proposing to Bernadette. When Howard finally popped the question, Bernadette accepted.