Infi-nut

The Infi-nut is a plant that appears in Far Future. It has a bit lower health than the Wall-nut, but it regains health over time. It can endure around 42 bites. It is a strange plant that is always there even when it has been eaten.

Almanac Entry
Infi-nuts are weaker than Wall-nuts, but they can regain health over time.

TOUGHNESS: Elevated

RECHARGE: Mediocre

As a young nut he spent way too much time standing between two mirrors and trying to look into infinity.

Plant Food Upgrade
Infi-nut's plant food will restore the health of the plant and sends a force field across the lawn adding an extra layer of defense to your lawn. The barrier can last for a long time, but falls after a few hits (probably around its normal health). This is very useful against Imp Cannons as it makes imps fall into water if its placed at the edge. There is only one zombie that can penetrate the force field, the Zombie Parrot, although this may be just a glitch.

Trivia

 * It is the only plant that can regenerate health naturally.
 * Its name is a portmanteau of "infinite" and "nut".
 * In Ancient Egypt, Explorer Zombies can potentially burn both the Infi-nut and its hologram projector so it can no longer regenerate.
 * Infi-nut will not count as losing a plant, making it helpful on days with a limit on lost plants.
 * According to the game's files, Infi-nut was originally called Holo-nut.
 * It is unknown how can zombies eat it, as it is a hologram and not a solid object.
 * Infi-nut's costume is a reference to "Ghostbusters".