Bambush

Bambush is a premium plant in Plants vs. Zombies 2 that can be unlocked for free by obtaining 100 seed packets during "Bambush's Military Season".

Origins
Bambush is based on a plant from Plants vs. Zombies Adventures (albeit without banada and dog tag)

Bambush's name is portmanteau of "ambush", referring to its ability and "bamboo", the real-life plant it based on.

Overview
When planted, Bambush hides underground and waits until a zombie passes over him. At that point, he resurfaces and lobs explosive shells that does heavy damage to zombies, similar to Celery Stalker. Each explosive shell deals 120 DPS to initial target and 50 DPS splash damage in 3x1 area. However, after about three seconds of having no zombies behind him, he hides again. Bambush is also a defensive plant that can absorb 1200 DPS.

Almanac entry
Prior to the closure of PvZ Adventures, Bamboom used to defend the town from zombies and now he's back to PvZ 2 under a new name and of course, a new ability.

Plant Food
When fed Plant Food, Bambush will lob three spiky explosive shells onto three random tiles. Each spike explosive shell deals 1800 DPS in 3x3 area.

Trivia

 * Bambush's Almanac entry mentions PvZ Adventures.
 * When fed Plant Food, a banada will appear.
 * A nod to Bamboom.