House Centipalm

House Centipalm is an instant-use, poisonous, mobile plant that scurries around the lawn to poison and knock back zombies.

Overview
House Centipalm is an instant-use plant. When planted, it will move forward in an irregular pattern, sometimes veering off into an adjacent row. It poisons every zombie it comes into contact with. This poison acts exactly like Shadow-shroom's poison.

It'll also push back every zombie it encounters by one tile. Zombies are also temporarily stunned for 1.25 seconds. As a negative side-effect, this also affects hypnotized zombies, reverting them back to their normal state.

House Centipalm is invulnerable, though it can be killed. This occurs when it is ran over, such as by a Pianist Zombie or a Zomboni, or if it falls into a gap or a body of water, such as in Pirate Seas or Big Wave Beach. Gargantuars will attempt to crush it, but they are either too slow or busy being stunned and knocked back.

Of course, since it requires contact to do any of its effects, House Centipalm does not affect flying zombies.

House Centipalm is based on the fronds of a palm tree (Arecaceae) and the house centipede (Scutigera coleoptrata). Its name is a portmanteau of "house centipede" and "palm."

Strategies
House Centipalm fills in the role of a multi-zombie poisoner, whereas Shadow-shroom affects only one zombie, Manchinill affects a small group of zombies, and Painsettia affects a huge group of zombies.

Unlike the previously mentioned plants, House Centipalm is somewhat unreliable. Due to its capability of randomly switching lanes, it may not poison the lane or group of zombies that you want. If you want to target a specific zombie, it is advised to plant House Centipalm directly on that zombie.

Centipalm's knockback could be utilized as well. Zombies affected will be airborne for a short period of time. Here you can use Hurrikale or Blover to instantly kill these zombies.

House Centipalm is mostly useless in water stages, as even if only specific lanes of water are present, the Centipalm may still scurry into the water and die.

Trivia

 * House Centipalm's poisonous nature derives from the actual house centipede's venomous bite.