Dark Horse Comics has announced sales of its Plants vs. Zombies books have topped 500,000 copies.
Dark Horse licensed PopCap’s Plants vs. Zombies video game property for comic adaptation last year (see "Comic-Con Round-Up: Dark Horse"), and began a comic series written by Eisner-winner Paul Tobin (Bandette, Colder), with art by Ron Chan (Star Wars: Knights of the Old Republic, Guy Ritchie’s Gamekeeper). 
The first six-issue series, Plants vs. Zombies: Lawnmageddon, was first serialized digitally, then released as a hardcover in November 2013.  Dark Horse followed this with The Art of Plants vs. Zombies in April.
The second six-issue series, Plants vs. Zombies: Timepocalypse is currently available digitally, with a hardcover collection releasing on January 13, 2015.  The series is also done by Tobin and Chan.  MSRP is $9.99.
Dark Horse credits strong sales across all its channels, in comic shops, book stores, and Scholastic book fairs, as contributing to making the books a hit.