Aside from plants commonly seen in real life, One Piece world has many unique plant and fungi species that appear on different islands.
Kuuigosu is a buoyant type of wood that is often used by coated ships. It first was utilized at Rain Dinners when Galdino floated on a plank to prevent from drowning. It was first shown when the Straw Hat Pirates descended to Fish-Man Island.
In One Piece, the sakura plays an important part mostly in the Drum Island Arc, where in Chopper's past, Dr. Hiriluk tried to make sakura bloom in the snow. It eventually did, although he did not live to see it happen.
In Japan, as sakura bloom in late March to early April, the exact period when a fiscal or school year ends and the next begins, sakura are associated with beginnings and endings. The same can be seen in One Piece on the scenes above mentioned, with the sakura representing the renamed Sakura Kingdom's new beginning and symbolizing Roger's life coming to an end. Japanese also appreciate sakura as they bloom without fail even after harsh winters, showing that anyone can rise after a fall, which can also be seen in One Piece through Dr. Hiriluk's faith that blooming sakura would save the country.
The Amiudake (アミウダケ Amiudake?) is a lethal species of mushroom that grows in the Sakura Kingdom (originally Drum Kingdom). Anyone who ingests the fungus will die an hour after consumption. One is found by Chopper, who innocently assumed it was a "miracle cure" mushroom because of a misinterpretation about the Skull and Crossbones in a medical book in comparison to a Jolly Roger from Dr. Hiriluk, to cure his fatal disease. Dr. Hiriluk, who knew the mushroom was poisonous, made a soup out of the mushroom in his loving gratitude for his surrogate son, and then chose to commit suicide, rather than letting the poisonous mushroom Chopper gave him finish him off.
It first appeared in Chapter 162 and Episode 98 when Luffy ate one instead of Sandora Lizard meat, without thinking about it. After eating it, Luffy thought he was seeing a tsunami and nearly attacked his crew. Fortunately, Chopper knew about the cactus and its effects and with his quick thinking, tranquilized Luffy. The effect had worn off by the time Luffy woke up.
Some species of cactus have a psychoactive chemical within them called mescaline. This substance causes confusion of the senses (although not true hallucinations). This is most likely the origin of the mescal cactus's name.
Thousand-Year Trees (千年木 Sen'nen Boku?) are, according to Rice Rice, trees that grow on Eight Nine Island. He also proclaims that that's where the Thousand-Year Paper is made. It also lives for a thousand years, and that's where it got its name.
Sky Island Saga
Giant Jack is a giant beanstalk in the center of Upper Yard. Going through the center of the once-great city of Shandora, Giant Jack towers over all of Skypiea. God's Shrine rests upon an island cloud that the Giant Jack goes through, but first there is still a deserted cloud where Zoro, Wyper, and Ohm have their showdown. The Golden Belfry was knocked up by Giant Jack, and resides on a cloud nearby.
Kona Trees are tall and possess thin trunks and leafy branches.
Within the bark of this tree is a substance known as Conine (コニーネ Konīne?). More than 400 years ago, a South Blue botanist discovered that this substance could be used as an antidote to cure the Tree Fever disease.
Oda confirmed in SBS Volume 32 that "Conine" and "Kona Tree" are inspired by Quinine (キニーネ Kinīne?) found in the bark of Cinchona (キナの木 Kina no Ki?) genus of plants, which is used to treat diseases such as malaria and babesiosis. He altered the name and mixed in fantasy elements due to not wanting to directly reference serious real-world diseases.
Water 7 Saga
Tree of Knowledge
The Tree of Knowledge was a gigantic 5,000-year-old tree located on the island of Ohara which served as a library and a hub for archaeologists from around the world. It was destroyed by the World Government via a Buster Call.
Treasure Tree Adam
Treasure Tree Adam (宝樹アダム Hōju Adamu?) is a mythical tree with wood that is considered the strongest, highest-quality wood in the world. Its immense rarity makes it highly valuable, being considered a great treasure. Occasionally, the wood is sold on the black market, at a very high price given its value. Franky managed to purchase some for 200,000,000. It is called "Jewel Tree Adam" in the English localization.
Summit War Saga
The Yarukiman Mangrove (ヤルキマン・マングローブ Yarukiman Mangurōbu?) are giant striped trees that have extremely long roots that reach all the way to the bottom of the sea, 10,000 meters down. Seventy nine of these trees make up the entire Sabaody Archipelago; so far, this is the only place they are known to grow. They are called the "Hustle Muscle Mangrove" in the English Dub.
Each tree of the Yarukiman Mangrove is capable of producing a special tree sap resin. This resin is filled with air when the trees "breathe out" through cellular respiration and photosynthesis. This results in the resin forming bubbles that float through the air. The resin bubbles are solid enough that someone can jump on them without popping them, however they are also completely permeable, allowing a person to ride in or store things inside of them without the bubble popping when they pass through.
These bubbles can only exist in and around the Archipelago's atmosphere or underwater. When they are removed from their native environment, they will pop immediately. Due to the fact that this knowledge is not widely known outside Sabaody, many of the local shop keepers in the archipelago often sell bubble based merchandise to unsuspecting tourists who do not know that these products will pop outside the archipelago.
The World Nobles use such bubbles as air helmets during their visit in the Archipelago, in order to protect themselves from "breathing the same air as commoners", while also taking advantage of the bubbles permeable nature, such as by eating ice cream though it, something that couldn’t be done through a regular helmet.
The tree's name is a pun on the Japanese phrase, "Yaru Ki Manman", which means "to be pumped up" or "motivated".
Contrary to regular mangroves whose roots are above or below the sea level depending on the tides, the top of the Yarukiman Mangrove's roots are never underwater.
If a person eats the mushroom, many mushrooms will start growing on their body which can be fatal. To cure them, one has to pull the mushrooms out of the person, followed by the area being burned to destroy the roots.
It is called the Body Parasite Mushroom in the Viz localization and the Parasite Mushroom in the Funimation subs.
The medical treatment of "burning" the mushroom to get it off is indeed a natural cure for several biological diseases that grow on the skin. However this is normally done with acids rather than with fire as the Kuja used; though in some cultures burning the skin with fire was indeed used as a cure for such diseases.
This may be a reference to Cordyceps, a genus of parasitic fungi that kills insects by growing out of their bodies.
A mushroom that induces the consumer to laugh happily out loud. It is perfect for those who are depressed and wish for a good time.
A mushroom that causes the consumer bouts of rage. An effective counter to this effect is eating a Laughing Mushroom.
A mushroom that causes the consumer bouts of weeping. An effective counter to this effect is eating a Laughing Mushroom.
Stomach Baron (ストマックバロ Sutomakku Baron?) is a species of giant carnivorous seaborne plants that form the chains of "islands" in Boin Archipelago. Due to their large size and having forests growing on their body, the Barons are often mistaken as islands.
The forests have "plants" that are made of a variety of highly nutritional and delicious food in the middle of the island (which is actually the "mouth" of the Barons) luring prey (including sea kings) to venture there before the Barons consume them.
The concept of the Stomach Baron is very similar to the Gourmetica insularis described in the 1999 novel „Die 13½ Leben des Käpt’n Blaubär“ (キャプテン・ブルーベアの13と1/2の人生 Kyaputen burūbea no 13 to 1/2 no jinsei?) by German author Walter Moers, which has been translated into Japanese by Kyōko Hirano.
Weather Ball (
Nami stole one of these inventions and it is later seen when she returns to Weatheria and asks Haredas how the Weather Balls work and if they can be turned into a weapon. Haredas is horrified at this thought and tells Nami not to say such scary things since the Weather Balls are capable of causing chaos around the world.
The Weather Balls can also be used to store little pieces of clouds in them. When a few Weather Balls with clouds are combined, a big cloud is formed. The cloud can also shoot lightning. Nami used such a feature to attack the Fake Straw Hat Crew, launching a miniature lightning storm to electrocute them, thus turning the Weather Balls into a weapon that she asked Haredas about two years ago.
Fish-Man Island Saga
Sunlight Tree Eve
Elegant Sunflowers (エレガントサンフラワー Ereganto Sanfurawā?) are luminescent sunflowers, which have seen in Dressrosa. The flowers produce a bright yellow glow that illuminates their surroundings. They first appear in Chapter 738 and Episode 671.
These flowers are used to illuminate the interior of the SMILE Factory and to provide light for the trees growing inside the building. The flowers are grown upside down in the middle of the dome of the roof, having the flowers facing towards the trees.
Mosa Mosa no Mi
Noko Noko no Mi
The Noko Noko no Mi is a non-canon Paramecia-type Devil Fruit that allows the user to create and control poisonous mushroom spores. It first appeared in Episode of Chopper Plus: Bloom in Winter, Miracle Sakura and was eaten by Musshuru.
Lily Carnation was a carnivorous plant that developed a parasitic relationship with Omatsuri. Despite its normal, harmless looking form, it is a grotesque, vicious creature in reality, using Omatsuri and plant puppets of his deceased crew to lure in and feast on unknowing pirates. It first appeared in Baron Omatsuri and the Secret Island.
This tree releases toxic spores that can kill both animals and people, although animals can notice it by its strong smell before getting infected. After being infected, the person starts to develop green skin spots. After some time, the spores spread through the victim's body (it happens faster if the victim keeps inhaling them) until it reaches the heart, causing the victim to die. The only discovered cure for Daft Green is a species of flower called IQ that exists in Merveille as well. Both Xiao's grandmother and Nami were infected by its spores.
When arranged well, the daft green can serve as protective barrier. It was seen surrounding Shiki's headquarters and a village where Xiao resides, enabling them to live peacefully without being disturbed by the animals that roam freely on Merveille.
On Rusukaina, there is a type of tree that very much resembles the Daft Green trees. Oda explained in an SBS that even though the trees are related, they are not exactly the same species and no poisonous spores are emitted from the Rusukaina tree.
Both the Daft Green trees and the trees found on Rusukaina heavily resemble members of the Adansonia genus of trees, commonly known as baobab trees.
A green tinge in the skin is sometimes associated with nausea and sickness. A physically ill person is said to look "green around the gills".
IQ (I.Q. Ai Kyū?) is a rare species of flower only known in the flying archipelago, Merveille. It first appeared in One Piece Film: Strong World. Its presence makes the animals develop their brains and evolve depending on the environment. This plant was later used by Dr. Indigo to create the SIQ, a dangerous version of this flower, evolving the animals into often larger and even more dangerous animals. IQ is also the only cure to the poisonous spores released by the Daft Green plant.
"I.Q." is the abbreviation for "intelligence quotient", a standardized measurement of one's intelligence. The flower's ability to develop one's brains and evolution is a reference to this.
The Drowsy Mushroom (?) is a type of mushroom that grows on Mushroom Island and was discovered very recently. It first appeared in Adventure of Nebulandia. Anyone who eats it will briefly lose consciousness. When they come to, they will not have any motivation to do anything. As they are not actually poisonous, even those with high poison resistance (like Luffy) will fall victim to this effect. Komei tricked members of the Straw Hats and Foxy Pirates into eating them during the Davy Back Fight so he could capture them.
The Rebound Mushroom (?) is a type of mushroom which also grows on Mushroom Island. It first appeared in Adventure of Nebulandia. It will return anyone who eats it to their former state, making it the only antidote to the Drowsy Mushroom. Chopper discovered it growing on the skin of Kinoconda, an animal native to Mushroom Island.
The Surprised Mushroom (びっくりキノコ Bikkuri kinoko?) is a mushroom species that appears in One Piece: Unlimited Adventure. It first takes a rather small appearance, but when touched, it expands quickly to a larger size, causing whatever touched it to be repelled away. In the game, it is used to jump on and launch players up to high places. Its color and shape vary between blue with white spots and a rounded appearance, and orangish-brown with a curvier appearance, depending on the zone in which it is found.
The Cannibal Flower (人食い花 Hitokuibana?) is a carnivorous plant species that appears in One Piece: Unlimited Adventure. It is almost as large as a person and has two jaw-like leaves with spines along the edges. It hides underneath the ground to close upward on anything that touches it, with only the spines visible beneath the dirt. They are resistant to physical damage and sharp objects like swords. It appears in the Jungle Zone.
The Burning Tree (燃えている木 Moete iru ki?) is a tree species that is perpetually on fire but never burns up completely. It appears in One Piece: Unlimited Adventure. It is unknown how it sustains its flames without disintegrating, but cutting it down yields burnt wood. It appears in the Ruins Zone and Dimension Zone.
The Doku Flower (ドクの花 Doku no hana?) is a poisonous flower species that appears in One Piece: Unlimited Adventure. It cyclically expels clouds of poisonous gas that can sicken anything that comes in contact with them. It appears in the Jungle Zone.
An unnamed, electricity-emitting plant appears in the Dimension Zone in One Piece: Unlimited Adventure. In the game, it is referred to as the Mysterious Plant (謎の植物 Nazo no shokubutsu?). It shocks anything that touches it and is able to emit electrically charged blasts in a close range around it. Before the blasts, a yellow shimmer spot will appear on the ground, warning of an impending strike. It behaves similarly to Enel's El Thor. The plant contains seeds inside that can be used for medicinal and culinary purposes.