Talk:Plants vs. Zombies 2/Upcoming content/@comment-27584933-20171013132512/@comment-24638751-20171014033250

They appear when a Zombie reaches your house, when a zombie reaches your house, you will have the option to hire a Security Gourd for gems rid of that Zombie, they will also knock any other Zombies back if there's some following that Zombie you may have ridden.