Wall-nut First Aid

Wall-nut First Aid can be purchased from Crazy Dave's Twiddydinkies for $2000 after you have beaten the game in adventure mode at least once. It allows you to plant new Wall-nuts, Tall-nuts and Pumpkins on top of damaged plants of the same kind, without having to dig them up first. This allows the player to replace a defensive plant when a Zombie is chewing on it without digging it up and giving the Zombie a chance to escape.