Infi-nut

The Infi-nut is a plant first appearing in Far Future in Plants vs. Zombies 2: It's About Time. It has half the health of a Wall-nut, but it regains health over time. It is a strange plant that is always there even when it has been eaten. It is obtained after completing Far Future - Day 13.

Almanac Entry
TOUGHNESS: Elevated

RECHARGE: Mediocre

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

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

Overview
The Infi-nut's hologram can withstand 36 bites and its appearance changes upon at 12 and 24 bites before disappearing at 36 bites. It will regain its health after 15 seconds without being bitten. In case its hologram disappears, it will take 15 seconds to reappear as well.

Plant Food upgrade
Infi-nut's Plant Food upgrade restores the health of the plant and sends a Force Field across the lawn, adding an extra layer of defense to the player's lawn. The barrier is increased in strength with each Infi-nut on the lawn. It is also capable of blocking flying zombies like the Tall-nut. It can withstand 180 bites.

Level upgrade: Projection (Chinese version only)
Level 2 (Fast Projection):

Level 3 (Projection strengthen):

Costumed (Chinese version only)
Plant Food ability can make one more Force Field.

Strategies
Infi-nuts are similar to regular Wall-nuts in terms of the fact that they serve as a "buffer layer" between attacking plants and zombies. They can keep the zombies from getting close to the plants and eating them. However, Infi-nuts have the advantage of being able to regenerate their health without the usage of Plant Food or Wall-nut First Aid, making them more useful in between huge waves, as it can potentially save sun using one row of Infi-nuts over regular Wall-nuts, or can save Plant Food for attacking plants. The main disadvantage is the lack of durability present with the Infi-nut. Infi-nuts are not suggested in Ancient Egypt levels with Explorer Zombies, as they can burn the projector as well as the Infi-nut, preventing it from ever coming back.

The Plant Food ability is arguably one of the most useful aspects of Infi-nut, as their ability protects a whole lane from zombies, over increasing the strength of one nut. It can cover the water rows in any Pirate Seas level, forcing Imp Cannons to never hit the lawn and making Seagull Zombies stop mid-lane to eat it. Using the Power Lily to make one Plant Food for the sole purpose of an Infi-nut barrier is equivalent, though faster, to planting one Wall-nut in each lane. It's also cheaper than a row of Tall-nuts to keep Imps from being hurled onto other plants.

Trivia

 * Explorer Zombie, Zombie Parrot, and Gargantuars are the only zombies that can completely destroy an Infi-nut.
 * Barrel Roller Zombie and Pianist Zombie can still roll over the hologram, but the projector will stay intact.
 * It is the only plant that can regenerate itself over time, hence the name "Infi-nut". Additionally, its name is a portmanteau of "infinite" and "nut", and the word "infinite" can be pronounced as /'ɪnfɪnʌt/ (homophonous with the aforementioned plant's name).
 * Three zombies can bypass Infi-nut's barrier by themselves without destroying it, and they are the Prospector Zombie, Swashbuckler Zombie, if the barrier is over a water lane, and the Zombie Parrot.
 * Unless the hologram projector is destroyed, an Infi-nut will not count as losing a plant, making it helpful on days with a limit on lost plants.
 * The game's files refer to Infi-nut as "Holo-nut".
 * This name might have been an early name of the Infi-nut.
 * Infi-nut's costume is a reference to the Ghostbusters franchise.
 * If the player plants an Infi-nut over a damaged Infi-nut, it won't regenerate, but no sun will be spent.
 * This renders the Wall-nut First Aid useless on this plant.
 * Mecha-Football Zombies and Gargantuars can take out Infi-nut's barrier in one hit.
 * Although it has an elevated toughness, its toughness can be compared to that of Imp Cannon, only added with ten less hit points.
 * This and White Radish are the only defensive plants that have Elevated toughness.
 * Oddly enough, plants can destroy the Infi-nut's force field, as long as their attacks hit the force field. This might be a bug.
 * It is unknown how the zombies are able to eat a hologram.
 * If a Swashbuckler Zombie lands and there is an Infi-nut in the fifth column with a Plant Food effect, instead of it eating the barrier it will eat the Infi-nut and once eaten, the barrier will also be gone. This is because the Infi-nut is the one making those barriers; however, there will still be a barrier if there are other Infi-nuts with a Plant Food effect.
 * When Infi-nut is using its Plant Food effect, the Wizard Zombies are forced to eat the force-field.