Wall-nut

The Wall-nut is the first defensive plant obtained in all Plants vs. Zombies games that acts as a shield for the player's plants. Vaulting Zombies can jump over Wall-nuts and surpass them without eating it. It is named after the edible seed walnut, specifically the Juglans regia. It is mainly used to stall zombies to waste their time, letting other plants attack them.

Plants vs. Zombies
Wall-nut is obtained after beating Level 1-3, but Pole Vaulting Zombie appears soon, and it can jump over the Wall-nut. Dolphin Rider Zombie and Pogo Zombie also appear later. Wall-nut has a stronger counterpart,Tall-nut,to block all of them. The player can use Wall-nut First Aid to plant a new one on a damaged Wall-nut. In this game, there are many mini-games to feature Wall-nut such as Wall-nut Bowling, Wall-nut Bowling 2 and Art Challenge Wall-nut.

Plants vs. Zombies Adventures
Wall-nut is unlocked after beating Level 5 of The Boonies. There is a VIP called Hard-nut that is a tougher version of the Wall-nut. Wall-nut, along with Hard-nuts can be jumped over by Mall Cop Zombie. Unlike other plants, it cannot be revived after it has been eaten. It will disappear after zombie sneak attacks if it got eaten during the attack.

Plants vs. Zombies 2: It's About Time
Wall-nut is obtained after beating Player's House - Day 2. The Wall-nut works the same way as it does in the first game. The player needs to protect them in Wild West Save Our Seeds levels.

Plant Food Upgrade
If Plant Food is used on Wall-nut, it gains an armor, giving it 160 extra health.

Plants vs. Zombies
Wall-nut

Wall-nuts have hard shells which you can use to protect your other plants.

Toughness: high

"People wonder how I feel about getting constantly chewed on by zombies," says Wall-nut. "What they don't realize is that with my limited senses all I can feel is a kind of tingling, like a relaxing back rub."

Cost: 50

Recharge: slow

Plants vs. Zombies 2: It's About Time
Wall-nut

Wall-nuts have hard shells which you can use to protect your other plants.

Toughness: high

Having retired from his days as champion bowler in the Pro Leagues, Wall-nut is looking forward to a real challenge on the front lines of home defense. DEFENSE! DEFENSE!

Cost: 50

Recharge: Sluggish

Plants vs. Zombies
The Wall-nut absorbs 72 bites and its appearance changes at 24 bites and 48 bites before finally being swallowed at 72 bites.

Plants vs. Zombies 2: It's About Time
The Wall-nut absorbs 80 bites and its appearance changes at 20, 40, and 60 bites before finally being swallowed at 80 bites.

Standard Levels
Most plants are very vulnerable to being eaten by Zombies, so you may need an extra line of defense. Wall-nuts are cheap and give you the most delay for their cost than any other Plant (except for Puff-shrooms, Sea-shrooms, and their Imitater variants, as they are free), so they can make a good early defense; especially when combined with a Spikeweed. Later, when you can afford it, you'll want to purchase Wall-nut First Aid from Crazy Dave's Twiddydinkies, as this will allow you to replace Wall-nuts that have been damaged without having to dig them up first. When a Wall-nut starts to look sad, it is about to die, so try to replace them quickly at that point. Note that Pogo Zombies, Pole Vaulting Zombies, and Dolphin Rider Zombies can easily get past Wall-nuts, but two Wall-nuts in a lane can prevent Pole Vaulting Zombies and Dolphin Rider Zombies from bypassing the Wall-nuts. Wall-nuts do not stall Gargantuars any longer than any other plant; they will only slow down Gargantuars for as long as it takes for them to smash the Wall-nut. The Wall-nut is also useful against Snorkel Zombies, as when planted on Lily Pads in the Snorkel Zombie's path the Snorkel Zombie will be forced to raise its head from the water, making it vulnerable to attacks.

Wall-nut Bowling and Wall-nut Bowling 2 Mini-games
Wall-nuts are your standard ammo in Wall-nut Bowling. They will take out normal Zombies, Pole Vaulting Zombies, Dancing Zombies, and Backup Dancers in one hit, Conehead Zombies and Newspaper Zombies in two, Buckethead Zombies in three, and Screen Door Zombies in four. After striking any zombie, the Wall-nut will bounce off at an angle, possibly hitting more Zombies before it rolls off the screen. It will also only bounce off towards the right as it does not make sense for it to go backwards. Try to hit more than one zombie with each Wall-nut, as on the iPhone version you will get the Roll Some Heads achievement, each additional zombie yields more coins (zero for the first, one for the second, two for the third, three for the fourth, and a gold coin for the fifth or any other zombies past it), and Screen Door Zombies only take one hit when hit at an angle. Also, remember that the Wall-nut doesn't have to go directly at a Pole Vaulting Zombie to make it jump - it just has to be near enough. Be ready with your nut, holding it in the most forward space (behind the red line), then, when the Wall-nut's picture of where it will be placed appears over the zombie, release. There are two Wall-nut variations found in these Mini-games: the Explode-o-nut and the Giant Wall-nut.

Explode-o-nut
The Explode-o-nut is found only in Wall-nut Bowling, Wall-nut Bowling 2 and Co-op Bowling. It can't be bought or planted outside the Mini-game without hacking. It is a red Wall-nut which, upon hitting a zombie, creates an explosion the size of that from a Cherry Bomb. It should be used where there is a cluster of stronger zombies. Rather than rolling it at the zombies, you can make better use of it by waiting until the zombies cross the line and dropping it in the middle of them.

Giant Wall-nut
The Giant Wall-nut is found in Wall-nut Bowling 2. When used, it rolls down a row and squashes all the zombies, acting as a sort of Jalapeno and Squash, because it hits all zombies in a lane and squashes them. Fortunately, it is too high to be vaulted by a Pole Vaulting Zombie. It does not bounce off zombies, but runs over them. However, you do not get any coins from the combos dealt from a Giant Wall-nut. You also cannot get the Roll Some Heads achievement with them. It also makes an appearence in the hidden mini-game Big Time, though it is for defensive purposes in Big Time.

ZomBotany and ZomBotany 2 Mini-games
The Wall-nut Zombies in the ZomBotany Mini-games are very resistant to damage. The best plan is to stop them with Wall-nuts of your own while hitting them with as much damage as you can. The Wall-nuts also serve to stop Tall-nut Zombies and the peas of Peashooter and Gatling Pea Zombies, so they are one of the best plants to use.

Beghouled and Beghouled Twist Mini-games
It is difficult to control when and where you will get Wall-nuts in this game, so it's almost pointless to upgrade them to Tall-nuts. If you do manage to get three or more on the front, try to leave them there and only complete matches in the rear lanes (especially Wall-nuts in any other column). It is a good idea to upgrade them eventually, but if you decide to it is best to wait until the other plants have been upgraded. Eventually, you should upgrade everything by the end of the game anyway.

Totally Nuts I, Zombie level
Ladder Zombies are pretty much required here unless you luck out and get a lane with no offensive plants at all. Ladder Zombies can survive many hits, so they are generally fine for any lane with only a single Peashooter or Fume-shroom in the second or third column from the left. If there is more than one attacking plant of any kind, you may need to follow the Ladder Zombie up with a Buckethead Zombie, and if there are Snow Peas you may need a second Ladder Zombie. Regular Zombies are almost useless on this level, except to follow a Ladder Zombie if it dies right before eating the brains. The Fume-shrooms can directly attack them.

Portal Combat
Use the Wall-nuts you get here to protect particularly vulnerable Portals (e.g. ones that lead straight to the back behind all your plants) from the front or from behind. Otherwise, just use them to block the zombies in particularly crucial locations. However, make sure that Balloon Zombies don't end up floating over them.

Big Time (PC hidden Mini-game)
In this game, Giant Wall-nuts appear again, but they are used like normal Wall-nuts, the difference being they have twice the health of normal Wall-nuts.

Plants vs. Zombies

 * If you play Wall-nut Bowling and open the Wall-nut's Almanac Entry, the Wall-nut is seen rolling in place.
 * The Wall-nut freezes while zombies are chewing on it, just like the Tall-nut. This freezing effect is also applied to the Lily Pad, the Plantern, the Pumpkin, and the Flower Pot. If you notice, these plants that freeze when being bitten are plants without offensive capabilities.
 * Wall-nut and Tall-nut are brothers, as Tall-nut's Almanac Entry says.
 * Although the Wall-nut is named after the walnut, it also resembles a coconut because of its hard shell and its ability to roll in Wall-nut Bowling.
 * The Wall-nut is one of five plants that will slowly degrade as they are eaten/damaged. The others are the Pumpkin, Tall-nut, Garlic, and Spikerock.
 * The Wall-nut, the Magnet-shroom, the Threepeater, and Squash are the only plants that are seen in a smaller size other than in the Zen Garden. The Wall-nut and is seen as small as Crazy Dave's hand when he talks to you before playing Wall-nut Bowling; the Magnet-shroom, the Threepeater and the Squash are seen on Crazy Dave when he tells you that you have to buy the full version when you're playing Plants vs. Zombies trial after completing Level 3-4.
 * In the Plants vs. Zombies website, when on the Zombatar tab, a Wall-nut with red hair can be seen in a corner of the screen.
 * The Wall-nut, Cob Cannon, Starfruit, and Gatling Pea are the only plants with mini-games dedicated to them.
 * The Wall-nut has the second most variations: regular, Explode-o-nut, Giant Wall-nut, Tall-nut, Imitater, Wall-nut Zombie, and Tall-nut Zombie. It's also the only defensive plant with more than 3 variations.
 * The Wall-nut and the Zombie (and its variants) both have the same eye design. The bigger eye is just flipped over.
 * The Wall-nut is grown in the Zen Garden with no roots.
 * If you look closely, the Wall-nut's mouth moves as if it is saying something.
 * In Wall-nut Bowling and Wall-nut Bowling 2, Pole Vaulting Zombies will jump quite earlier before the Wall-nut rolls one square in front of it.
 * In the DS version, Pole Vaulting Zombies can be hit by a Wall-nut after they jump over it, but this is a very rare occurrence.
 * According to the Tree of Wisdom, Wall-nut and Chomper were once roommates in college, which is why they work well together.
 * Occasionally, the Wall-nut will end up blinking while a zombie is eating it, due to the freezing of its animation.
 * The Wall-nut is one of five plants whose purpose is to be chewed on. The other four are the Tall-nut, Pumpkin, Garlic and the Hypno-shroom, all but Hypno-shroom are defensive plants.
 * Wall-nut is hollow on the inside, as seen when zombies eat it.
 * Wall-nut's eyes sometimes twitches while being eaten.
 * It is unknown why the Wall-nut is planted behind most plants in the loading screen.
 * Wall-nut and some of its variants are the only plants that are offensive and defensive. It's offensive in Wall-nut Bowling and defensive in regular levels.

Plants vs. Zombies Adventures

 * If the player wins a level with a damaged Wall-nut, it will not look damaged at the end of the level.
 * The same goes to Hard-nut and other KO'd plants.
 * Wall-nut will have big eyes if the player wins the level

Plants vs. Zombies 2: It's About Time

 * This is one of the six plants seen in the trailer of Plants vs. Zombies 2: It's About Time while fighting the zombies, the other five are Bonk Choy, Bloomerang, Peashooter, Pea Pod, and Sunflower.
 * Its Almanac entry mentions that Wall-nut is a retired bowler, which is an obvious reference to the Wall-nut Bowling mini-games from the first game.
 * The Wall-nut now has three degrades.
 * The Wall-nut, along with the Peashooter and the Sunflower, are the only plants which have costumes that change depending on the season.
 * In the 1.9 update, there's a texture glitch for Wall-nut's eyes, along with the Snow Pea, Threepeater, and Twin Sunflower.
 * Even though Wall-nut First Aid returns in this game, the Wall-nuts you have to protect in Save Our Seeds are unaffected by it. This is probably to make the level harder.
 * If the player has a Wall-nut Boost, and places it on a already damaged Wall-nut, the boost will not activate.
 * In Day 8 of every world, and day 10 of Dark Ages, there are only five Wall-nuts given to the player.