Answer: Iago talks about planting, while he is the one who subtly plants seeds of doubt in Othello's mind.
Step-by-step explanation:
In Shakespeare's Othello, Iago is a rather deceitful character. He pretends to be Othello's friend, and meanwhile plots against him. He is jealous of Othello and wants to destroy his life, which involves deceiving other characters as well.
In Act I, Scene III, while having a conversation with Roderigo, Iago talks about gardens. As he argues, whether the garden will be barren or rich depends on what we plant in it and how we plant it. This parable (spiritual lesson) of Iago's is ironic, because Iago is the one who plants the seeds of doubt in those around him. He then "cultivates" their doubt until it results in a deadly conflict. He convinces Othello that Desdemona is adulterous, which leads to Othello murdering her. As we realize while reading the play, Iago is a master of "planting."