Plants vs. Zombies' sales certainly aren't shambling, as PopCap tells Joystiq that it has been the fastest-selling game in the company's electronic narcotic pharmacy.

PopCap's Garth Chouteau believes this is just the tip of the iceberg for the the flora vs. undead simulator, telling Joystiq, "It's as strategic as any game launched this year ... in it's own humble cutesy sort of way." He believes that players will continue to find incredible depth in the title, especially after they are done with the adventure's story and move into the survival mode. It appears that PopCap is happy with the sales of its latest piece of interactive crack, but it knows it'll only get better as the junkie word-of-mouth increases.

This article was originally published on Joystiq.