[[quoteright:315: [[Webcomic/{{xkcd}} http://static.tvtropes.org/pmwiki/pub/images/know_your_vines_2145.png]]]]
[[caption-width-right:315:[[http://xkcd.com/443/ Friggen' modern tents don't]] [[AltText have a single piece of rope.]]]]

->''"Hmmm... delicious tea? Or deadly poison?"''
-->-- '''Uncle Iroh''', ''WesternAnimation/AvatarTheLastAirbender''

A character is in a very nature oriented setting, with all kinds of wild plants surrounding them. They're doing whatever it is they planned to do, and at some point pick up or walk into an ordinary looking plant. After a small amount of contact with it, someone who is more knowledgeable about nature will casually inform them "That's poison ivy" (or poison oak, the plants have the same toxin).

Note: These are generally played for laughs. If you're weak of stomach, do ''not'' Google the types of injuries these plants can create (Unless you'd really like to see an example of a blister the size of a football). Oh, and poison sumac, if burned, releases a gas that causes allergic reactions that can kill. It really pays to know your plants before you go hiking.


[[folder: Anime and Manga]]
* In ''Manga/DailyLifeWithMonsterGirl'', protagonist Kimihito's very low on funds for food to feed his UnwantedHarem. Part of his hunt for food leads him into a forest filled with both edible plants and very poisonous ones. He was originally going to give up on the plants all together, but SlimeGirl Suu proved she could [[NewPowersAsThePlotDemands safely distinguish between the poisonous plants and the ones that were safe to eat]].

[[folder: Comic Books]]
* One ''Franchise/ArchieComics'' story ended with the revelation that the corsage Archie gave Veronica to wear at the prom was poison ivy.
** Oh, it gets worse. There was another comic where Archie lost his shorts in a swimming hole, and Jughead made him an impromptu grass skirt out of nearby vines. Yep--they turned out to be poison ivy.
* In an early issue of ''ComicBook/ArchieComicsSonicTheHedgehog'', Sonic was picking flowers to bring to Sally, only for a random background character to wander by and inform him that he's making his girlfriend a bouquet out of poison sumac. Then he starts scratching madly, which makes him swell up until he can't move. This, unfortunately, coincides with Robotnik making Pseudo Sonic, a robotic duplicate meant to infiltrate Knothole and discredit Sonic.

[[folder:Fan Works]]
* ''FanFic/TheLegendOfSpyroANewDawn'': After going awhile into the forest temple, Sparx begins getting an unpleasant rash. Ember identifies the plants in the bush he passed through as poison ivy, which she knows because her mother taught her about it (not because Dragons get poison ivy, which they don't, but because eating it is really dangerous).
* One ''Series/SavedByTheBell'' fanfic, "The One Gigantic Fix", riffed on by [[Blog/ToplessRobot Rob Bricken]] [[http://www.toplessrobot.com/2010/03/fan_fiction_friday_zack_morris_in_the_one_gigantic.php here]], uses poison ivy as the reason why Zack has a permanent erection and thus needs some DeusSexMachina to save him. Maybe.
-->''Now,it might had been the fact that he had covered himself with something that might possibly had been poison ivy or that there was something in the water.[[ShrugOfGod I really don't know]].''
* ''Fanfic/CalvinAndHobbesTheSeries'' reuses one bit from ''ComicStrip/CalvinAndHobbes'' below.

[[folder:Films -- Animation]]
* Early in the movie ''WesternAnimation/{{Coraline}}'', the title character brushes some leaves off a stick and uses it as a water rod. She meets Wybie, and has a fairly long conversation with him, and at the end he throws in that the stick she's holding is poison oak.
* When Sid's girlfriend leaves him in ''WesternAnimation/IceAge5CollisionCourse'', he asks if it was because he made her a bikini out of poison oak. He then absent-mindedly uses said bikini as a handkerchief, causing his nose and eyes to swell up.
* In ''WesternAnimation/{{Trolls}}'', Poppy eats a berry that causes her to get spots all over her body and swell up into a ball.

* ''Literature/ThePoisonwoodBible'' by Barbara Kingsolver: at one point, an American missionary in Congo ends up with tree sap on his arm and forehead, but pays it no heed. A local tells him "That tree, it bites", a warning he can't make sense of. The next day, he wakes up with a severe skin irritation where the sap was.
* In ''[[Literature/TheThrawnTrilogy Heir to the Empire]]'', Mara Jade knows perfectly well what the leaves of a certain vine do to human skin, and brushes Luke's arm with the tip of one to prove how it will be a useful disguise element, much to his dismay. She takes great delight in how it hurts and then itches, and asks if he wants her to apply it or he'd rather do it himself. He'd rather do it himself. When Imperials find them, one asks what the hell happened to his face, and he grunts "Walked into a bush."
* Something similar to this trope occurs in ''Literature/GalaxyOfFear''. Tash climbs a tree to escape attention, then starts crawling her way through the treetops, well above the threat she's trying to avoid. Unfortunately, at some point she crawls into the branches of a vesuvague tree, which [[TentacleRope snares her in its vines]] and [[CombatTentacles threatens to strangle her]].
* In one of ''Literature/TheBabySittersClub'' books where the sitters go to camp, Stacey finds "a comfortable patch of leaves" to sit in during the campfire on the first night. She spends most of the rest of the trip in the infirmary.
* In ''Discworld/TheLastContinent'', Rincewind discovers a vine which, if you carefully peel off the bark, gives you a nasty rash. What he'd been ''trying'' to find was a vine which, if you carefully peel off the bark, gives you a serviceable twine. It took him several more rashes to achieve that part.

[[folder: Live-Action TV]]
* After a huge fight and emotional breakdown with an unrequited love interest in a forest, the title character of ''Series/MalcolmInTheMiddle'' dries his tears with some leaves he found. The girl he is with tells him he's using poison oak. We see a rather disturbing shot of his face a little later, which resembles the character No-Face in Twisted Metal Black.
* In ''Series/{{NCIS}}'', while investigating a murder in a national park [=McGee=] has to search a patch of poison ivy for a murder weapon. Tony recognizes what the plant is, but decides not to tell him. To be fair, Tony had been telling [=McGee=] about searching in the outdoors, when [=McGee=] went off on him for treating him like a probie, and assures Tony that he learned plenty in Boy Scouts.
* Stuart and Ann's camping misadventure on ''Series/LALaw''. Remember the TP next time.
* ''Series/TheCloser'': In "Lover's Leap", Brenda ignores Buzz's urgent attempts to tell her something while she is examining a crime. What he was trying to tell her was that she was standing in poison oak. This later becomes an important clue in revealing the killer.
* ''Series/{{Fargo}}'': In "The Heap", Ida mentions that when Vern was courting her, he gave her a bouquet of poison ivy. Which he picked himself.
* On ''Series/{{ER}}'', after Mark and Elizabeth return from a camping trip, she is seems scratching at her hands. A fellow doctor diagnoses her with poison ivy. When she asks if it will spread, he tells her it depends on what she last touched. AnswerCut to Mark scratching his nether regions.
* On ''Series/MyNameIsEarl'', Earl meets up with an old friend, [[ItMakesSenseInContext who is now living in an abandoned bookmobile in the woods.]] The man has been living off of berries that have been causing him to hallucinate, and to believe he's married to a beautiful woman named Irene. [[spoiler: It turns out that [[BestialityIsDepraved "Irene" is a raccoon.]]]] Earl recalls, too, that Joy ate those same berries on a camping trip they took while they were still married, and she too, did the MushroomSamba.
* A variation of this on ''Series/ParksAndRecreation''. The character Jerry is initially introduced as the leader of pre-teen nature walks. He plucks a plant called country honeysuckle, which Leslie smells and takes a bite of. She quickly spits it out saying it's bitter, and Jerry tells her she shouldn't have eaten it: "the animals know you don't eat the country honeysuckle." Leslie's tongue swells and grows numb.

* Just one of the many hazards of life in Camp Granada as described by Creator/AllanSherman in ''Hello Muddah, Hello Fadduh (A Letter from Camp)'':
-->''I went hiking with Joe Spivey\\
He developed poison ivy''

[[folder: Newspaper Comics]]
* ''ComicStrip/CalvinAndHobbes'': after Calvin utterly fails a report on plants, he angrily asks what good it does to identify plants while holding a branch. Hobbes then replies "I believe that's poison sumac you're holding." He also regularly runs afoul of poison ivy during family camping trips.
* In ''ComicStrip/FoxTrot'', Jason and Marcus get sent on a night hike through poison ivy as part of an EscalatingWar of pranks with the girls. They compound the folly by deciding to use the leaves as camouflage.
** Another ''ComicStrip/FoxTrot'' has Jason and Marcus running through fields covered in poison ivy in an attempt to escape from Peter after they shot him in the face with superglue-covered suction darts. In this case Jason and Marcus ''did'' know their vines but decided it was better to deal with the poison ivy than be caught by Peter (who seems in the mood to re-enact ''Film/TheShining'').

[[folder: Video Games]]
* Unisys Icon game ''A Week in the Life of...'' had one of the characters in some hiking trip. The end of that character's storyline required the player to remember what poison ivy looked like, then required having him run through plants as a TimedMission. Also, plants were placed more rapidly on faster systems, and were randomly chosen: slower computers are better.

[[folder: Webcomics]]
* [[http://xkcd.com/443/ This]] ''Webcomic/{{xkcd}}'' comic is the TropeNamer.
** Ironically, the oxalate crystals in Virginia creeper [[http://en.wikipedia.org/wiki/Toxicodendron_radicans#Similar-looking_plants can also]] cause an allergic reaction in some people.

[[folder: Western Animation ]]
* The early camping episode on ''WesternAnimation/HeyArnold'' ended with Big Bob Pataki rushing through a small bush blocking the path (after interrupting Arnold that they have to go around it) to get back to his campsite after a disastrous hike. This bush, of course, was poison ivy, causing him more misery.
* On ''WesternAnimation/TheSimpsons'', in a three story episode about history, Lisa as Sacajawea is giving Lewis and Clark's expedition party quick advice, and tells one soldier that he's holding poison oak.
* ''WesternAnimation/TotalDrama Island'' had Katie and Sadie both squat in poison ivy to pee. HilarityEnsues.
* On ''WesternAAnimation/KickButtowski'', Kick and Brad are lost in the woods. While Kick, who likes to rough it, sleeps on the bare ground, Brad brags about how Kick wished he had a comfy blanket of natural foliage like him. "You're right, Brad. I wished I had a blanket of poison ivy."
* On ''WesternAnimation/{{Stoked}}'', Reef picks wildflowers for Finn and leaves them on her bed. Unfortunately, there is poison ivy mixed in with the flowers.
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "Bridle Gossip", the mane six walk through a patch of bright blue flowers to stop Apple Bloom following Zecora. The next morning they wake with embarrassing changes, such as Pinkie having swollen tongue and Applejack being shrunk to miniature size, all of which they blame on a curse cast by Zecora. It's eventually revealed that the flowers were from a magical plant called 'poison joke', and the girls' ailments were a side effect of the plant.
* On ''WesternAnimation/{{Animaniacs}}'', in "Sound of the Warners", after using the bathroom in a bush, Dr. Scratchansniff gets an awful itch, because he was in a poison oak bush.
* On ''WesternAnimation/TheWildThornberrys'', Nigel starts to get real itchy from what is believed to be poisonous plants, but he is immune to them because he rubbed some of them all over his body. It turns out that it was chicken pox, which he missed as a kid.
* ''WesternAnimation/CampLazlo'': "Raj? Why are you hiding in that poison ivy?"
* In the ''WesternAnimation/PacMan'' episode "Backpackin' Packy", Pac-Man was giving the scouts a plant identification lesson when he picked up a leaf that he learned too late would give him a severe itch.
* ''WesternAnimation/AdventuresOfSonicTheHedgehog'' used the same basic Pseudo Sonic plot as the above-mentioned Archie Comics incidence, (not sure which came first) although since in this incarnation Sonic has no girlfriend for whom he might be inclined to pick flowers, he just randomly blunders into an entire valley full of "poison flowers" while saving a character from a completely different threat.
** One [[AndKnowingIsHalfTheBattle Sonic Sez]] segment was about how to identify poison ivy. Hilariously, the poisonous plant shown looked more like marijuana.
* In the second season of ''WesternAnimation/AvatarTheLastAirbender'', Iroh has a run-in with some of these.
--> "Delicious tea?... Or ''deadly poison''?"
** Needless to say, the plant in question was poisonous, causing him to break out in a rash. [[CasualDangerDialogue "When the swelling reaches my throat, I will stop breathing."]] And to show he hasn't learned his lesson, Iroh brings out some berries that may cure him or make him blind. Needless to say, Zuko insists they find a doctor.
* ''WesternAnimation/TheDayMyButtWentPsycho'': In "Snoozing Booty", Zack is trying to trick Eleanor into kissing Deuce (ItMakesSenseInContext), so [[UnderTheMistletoe he holds some mistletoe over him]] and claims it's the law that she has to kiss him. She points out that that is not an actual law, and that what he is actually holding isn't mistletoe but poison ivy. As Zack runs around screaming, Eleanor then hands him the poison ivy vine to scratch himself with.
* Like the ''WesternAnimation/{{Trolls}}'' example above, when WesternAnimation/{{SpongeBob|SquarePants}} and Patrick got lost in a forest on a road trip, [=SpongeBob=] looked for food and found a type of berry which caused him to instantly swell up and turn purple. He didn't need an antidote, as he could just pop himself like a balloon with a pin and [[HealingFactor regenerate]].


[[folder: RealLife]]

* This is the main hazard posed by [[NamesToRunAwayFromReallyFast "Stalin's revenge"]], also known as the giant hogweed. It's a grass taller than most sapling trees. The poisonous sap/juice of this plant is really potent and causes burns comparable to mustard gas. It's also basically the Eastern European equivalent of kudzu, an imported plant that the authorities considered potentially useful but it spread uncontrollably all over the land. The worst part? It looks harmless, even beautiful, if you don't know better, as many city kids learn to their chagrin after a trip to the country.
** Its leaves are also broad, large and inviting as impromptu toilet paper. Many a CitySlicker temporarily lost the ability to sit painlessly because of this plant.
** The stems are cylindrical and hollow and make a great pretend telescope.
* Creator/StephenKing's autobiography ''On Writing'' has an anecdote about going to the bathroom behind a tree and using some nice shiny leaves to wipe his behind.