A corn stalk is a plant, farmed to obtain corn, from the MysticNerd expansion pack.
It can be planted on hoed ground, with corn seeds. The bottom will be the corn. As it grows, the corn will stay on top. Under it is the stalk. When a player breaks the stalk blocks, they will get corn seeds, and everything above will break. If they break the corn, they will get corn on the cob, and cornstalk.