Grave (PvZ)

A Grave will release zombies during each wave on every level where they are present. They randomly populate two-thirds of the front lawn at Night, and nothing can be planted on the spaces they occupy. Grave Busters will remove a grave, and produce a silver coin ($10), or occasionally something more valuable, such as a gold coin ($50), Chocolate, a diamond ($1,000), or a plant for the player's Zen Garden which is good.

They are also planted by the player who is playing as the zombies to generate Brains in Vs. Mode.

Whack-a-Zombie
Graves appear in the Mini-game Whack-a-Zombie, and new ones will appear every so often. In it, they release zombies, which must be whacked before they reach the house. However, if a Grave Buster is planted on a grave, no zombies will begin to come out, not even on the final wave. Any zombie that already started to come out will finish and start eating the Grave Buster. If there are fewer than six graves at the start of each small wave, it is possible for two graves to appear, with one slightly delayed behind the other.

Survival: Night
In the normal and hard versions of Survival: Night, new graves will also appear right before each final wave, even on top of plants if the lawn is completely filled with them. Also, if a Grave Buster is planted on a grave as the final wave begins, zombies will still come out of it.So, in these levels it is best not to fill in the lawn.

Gallery of Graves
There are big and small versions of every grave which sometimes have inscriptions on them. They refer to the euphemisms used in Monty Python's Dead Parrot sketch.

Trivia

 * In Survival: Night and Survival: Night (Hard) if the whole lawn is filled the plant will be removed, and a grave placed there instead. However, if there is even one empty space on the right half of the lawn, the grave will not remove the plant.
 * In the online version of Survival, the number of graves that will appear is the number of pairs of waves that you have progressed through, the maximum is 12.
 * Many options in the main menu and quick play are written on graves.
 * There is a cancelled minigame which has respawning graves known as "Grave Danger".
 * It is unknown why graves contain coins, diamonds and presents.