The Lawn is where ZomBotany takes place. It is in the Day and Night Stages of Plants vs. Zombies. There is nothing special in the Lawn at Day. But in Night levels, graves will appear, making Grave Busters useful. The Lawn can have any non-aquatic Plant on it. Mushrooms during the day will fall asleep, so you will require a Coffee Bean which is only obtained during the later Roof level.