DJ 20 growing from a grave

"Even in the graveyard... to make manifest an unspoken crime?" This means that because this person kept his secret and something grew from his heart. Roger is saying this to Dimmsdale because he is trying to get Dimmsdale to tell him the secret about him. Even though something can grow in something so dark such as graveyard from someones corpses. Yet it can be beautiful because its showing life.