Corn Mortar is a plant in Plants vs. Zombies: Garden Warfare. It acts like the Cob Cannon from Plants vs. Zombies. It only appears in Gardens & Graveyards in the map Main Street (and Main Street Night) on the final objective. They are in charge of defending the Garden Center from the zombies. It deals 70 damage maximum per corn cob.
The best thing you can do as plants is to sit back behind the Corn Mortars and wait for a zombie to approach, as there is a high chance for a zombie to escape. One of the zombies might try to destroy a Corn Mortar. While it does so, this is your chance to sneak behind that zombie and kill it. If you are a Chomper, make sure you goop it first to make it an easy target.
Against[]
An effective strategy is just to try to avoid the Corn Mortars in the hallways near the Corn Mortars to avoid the large splash damage. Another solution is to try to destroy them or at least one of them to make it easier for your other teammates to get past them. Note that they are extremely hard to destroy, and a plant may vanquish/harm you while doing so. If you are an Engineer, it is a good idea to build a teleporter as fast as possible, as by doing so will allow you and your other zombie teammates to skip the whole way through the Corn Mortar. However, still try to destroy the Corn Mortars because the teleporter might get destroyed.
Gallery[]
Plants vs. Zombies Wiki has a gallery for Cob Cannon.