A warning! This bounty-hunting orange from the future likes his battles both defensive and aggressive. Citron is known for putting walls of Wall-Nuts and then firing heavy artillery from behind them. Incoming!
”
—Dr. Zomboss
Citron is a plant hero in Plants vs. Zombies Heroes, and the leader of the Guardian and Smarty classes. Citron's signature superpower is Template:PvZHLink, which makes all plants so that they can't be hurt for the turn it is played, and gives Citron a card.
Citron combines the two Amphibious Plant classes: Guardian and Smarty. His water wing wins the game in the water lanes while his defensive Guardian Plants hold the ground.
With
Citron may prove to be a very difficult hero to play as for most players, but becomes quite formidable as you learn how to use him. Due to his access to both Guardian and Smarty plants, Citron proves most powerful in his ability to stall for time and avoid taking damage. His defensive Team-Up plants, such as nuts, will tank a good amount of damage. His Freeze and Bounce plants can temporarily disable priority zombie targets so that they can be properly dealt with later on. He also has the ability to cover all lanes with access to a large number of Amphibious plants, some of which are also Team-Up and can help defend more valuable Amphibious teammates. His superpowers also allow him to stall for time - Transmogrify is great for dealing with troublesome zombies, while Nut Signal, Root Wall, and Template:PvZHLink are extremely effective at blocking damage.
With all these tools at his disposal, Citron should be able to stall until he can bring out the big guns - and protect those guns as well. The Great Zucchini functions impressively well with Splash Damage characters to clear the board. Those valuable multi-lane attack plants should be protected with nuts and other Team-Up tanks, or possibly Peel Shield if none are present.
Against
Citron is a foe to be reckoned with. He has access to more amphibious plants than any other plant hero, requiring the player to pay attention to all water lanes on the field. His signature power, Peel Shield, when used correctly can be equivalent to Uncrackable, so you should bring destroying tricks in case your fighters cannot take out Citron's plants on their own.
Strategy Decks
Water Works
Swim toward a swift victory with this soaking wet Strategy Deck. Use Navy Bean to buff Amphibious Plants including The Great Zucchini, who'll make your opponents' chances disappear.
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Make a Splash
Use Gardening Gloves and Rescue Radish to repositon splash damage Plants like Snapdragon and Winter Melon so they can deliver maximum hurt. Meanwhile, Rescue Radish lets you et multiple uses out of Chilly Pepper, Brainana, and others.
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The Great Wall
Use your Nuts to keep the Zombie menace at bay! Meanwhile, Soul Patch combines with Peal Shield and Root Wall to make you immune to damage. The Great Zucchini cuts the Zombies doewn to size, and Wall-Nut Bowling finishes them off.
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Gallery
Plants vs. Zombies Wiki has a gallery for Citron (PvZH).
Visit this page to see it.
Trivia
His signature superpower is a reference to Peel Shield in Plants vs. Zombies: Garden Warfare 2.
All of the zombie missions that have Citron as the main opposing plant hero have exclamation marks in their names.
Citron's battle music is a remixed version of Green Shadow's, with more brass opposed to woodwind. This is shared with Captain Combustible.
His design in this game is based off his design in Plants vs. Zombies: Garden Warfare 2 rather than his original design in Plants vs. Zombies 2.
He has the most Amphibious plants of any plant hero.
He also has the most Team-Up plants then any other Plant Hero.
This is because he leads Guardian and Smarty classes, which are the only classes with amphibious plants.
Citron's description references the infamous issue of attempting to rhyme with orange, something that is frequently depicted as being impossible due to there being no words to rhyme with orange.
Ironically, there are two words that rhymes with orange; those being blorenge, and sporange.
Guardian and 
Smarty classes. Citron's signature superpower is Template:PvZHLink, which makes all plants so that they can't be hurt for the turn it is played, and gives Citron a card.
Guardian, 
Freeze and Bounce plants can temporarily disable priority zombie targets so that they can be properly dealt with later on. He also has the ability to cover all lanes with access to a large number of Amphibious plants, some of which are also Team-Up and can help defend more valuable Amphibious teammates. His superpowers also allow him to stall for time - Transmogrify is great for dealing with troublesome zombies, while Nut Signal, Root Wall, and Template:PvZHLink are extremely effective at blocking damage.
Kabloom
Mega-Grow
Smarty
Solar