PopCap Games announced today that the iPhone version of its backyard defense mega-hit Plants vs. Zombies has shattered sales records for an App Store launch, selling more than 300,000 units in its first 9 days.

Bringing in more than $1 million so far, the app quickly climbed to the #1 spot on the Top Grossing chart in less than 24 hours and held that position until it was overtaken by Gameloft’s Brothers In Arms 2: Global Front earlier this morning. With more than 95% of those who have rated the game in the App Store giving the release 5 stars, PopCap also claims that Plants vs. Zombies is the highest-rated game on the service as well.

Plants vs. Zombies is our latest major franchise to make the jump to iPhone, and from the early customer and critical feedback it appears to be a great adaptation of the game,” said Andrew Stein, director of mobile business development at PopCap. “There’s always a concern when bringing a computer game to a mobile, pocket-sized device that something will get lost in the process, but in this case the overwhelming consensus is that Plants vs. Zombies is even more fun on the smaller touch screen!”

Plants vs. Zombies isn’t the only iPhone game that PopCap has reason to boast about lately. The company has also announced that Bejeweled 2 has now become the first paid app to reach 3 million units on the App Store – no small feat on a service offering more than 150,000 apps.