Octogrape

Octogrape can grab four zombies in total from the lanes above and below it, not it's row. It also turns slightly invisible when planted, causing zombies to walk right through it. It cannot be eaten when its not attacking and will disappear when finished grabbing four zombies. If the zombie is fast enough, it can eat Octogrape while Octogrape is grabbing a zombie.

Trivia

 * Octogrape was originally going to be a prune or plum.
 * Octogrape only has six tentacles, while real octopusses have eight.