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The Blue Oleander is a species of flower. It is poisonous to reptiles if they eat it. However, the Scauldron is the only reptile immune to the flower and makes the dragon venomous.

Background[]

Physical Appearance[]

The Blue Oleander is known to be a short bushy plant that grows blue flowers. It has five separated petals and the leaves are ovate that end in an acute tip.

Role in the series[]

In "Dragon Flower", Mildew got the Blue Oleanders from Trader Johann and planted them on Berk. During the night, the Dragon Riders then noticed the flower and wondered what they are and Fishlegs tells are Blue Oleanders.

Hiccup then carries a basket full of Blue Oleanders into the sea to lure Scauldron. The basket of Blue Oleanders land on Mildew's face. The flowers began to slide down the ship and the Scauldron starts to feed on them. The Scauldron noticed one Blue Oleander on Mildew's butt and bite him there.

In "When Darkness Falls", as the Dragon Riders search for a safe island for themselves they found an island that looks safe but then stumbled across some bushes full of Blue Oleanders which are poisonous to dragons.

In "Defenders of the Wing, Part 1", Viggo surround himself with Blue Oleanders to keep the dragons out while having Hiccup in a meeting.

Trivia[]

  • The Blue Oleander is the first plant to be used as a weapon.

Navigation[]

v - e - d
Media
Films: How to Train Your DragonHow to Train Your Dragon 2How to Train Your Dragon: The Hidden WorldHow to Train Your Dragon (2025 film)How to Train Your Dragon 2 (2027 film)

Shorts: Legend of the Boneknapper DragonGift of the Night FuryBook of DragonsDawn of the Dragon RacersHow to Train Your Dragon: Homecoming
Shows: DreamWorks Dragons (Episode List) • Dragons: Rescue RidersDragons: The Nine Realms
Video games: How to Train Your DragonDragons: Rise of Berk

Characters
Protagonists: Hiccup Horrendous Haddock IIIAstrid HoffersonStoick the VastValkaGobber the BelchFishlegs IngermanSnotlout JorgensonRuffnut ThorstonTuffnut Thorston

Allies: Eret, Son of EretMalaHeatherAtaliGustav Larson
Villains: The Red DeathDrago BludvistGrimmel the GrislyWarlordsDagur the DerangedTrader JohannAlvin the TreacherousViggo GrimbornRyker GrimbornKrogan
Others: GothiSpitelout JorgensonZephyr and NuffinkMindenBucketMulchSilent SvenMildewCaptain Vorg
Dragons: Night Fury (ToothlessLight Fury) • Deadly Nadder (Stormfly) • Gronckle (Meatlug) • Monstrous Nightmare (Hookfang) • Hideous Zippleback (Barf and Belch) • ThunderdrumHotburple (Grump) • FirewormScauldron (Scauldy) • Whispering Death (Toothless' Rival) • Smothering SmokebreathChangewingScreaming DeathFireworm QueenFlightmareSkrillLead StingerSpeed StingersRumblehorn (Skullcrusher) • Stormcutter (Cloudjumper) • TimberjackSnaptrapperTerrible TerrorBoneknapperBewilderbeastSeashockerRazorwhip (Windshear) • Typhoomerang (Torch) • SeashockerDeathgrippersSlitherwingSpeed StingerShellfireSubmaripperDramillionCatastrophic QuakenSingetailSandbusterForeverwingGronciclePurple DeathHobgobblerShivertoothSilkspannerSliquifierSweet DeathTide GliderWoolly Howl
Animals: GrimoraSheep

Songs
How to Train Your Dragon: Sticks and Stones

How to Train Your Dragon 2: For The Dancing And The DreamingWhere No One GoesInto A Fantasy
How to Train Your Dragon: The Hidden World: Together From Afar

Cast
Films: Jay Baruchel (Hiccup) • America Ferrera (Astrid) • Jonah Hill (Snotlout) • Christopher Mintz-Plasse (Fishlegs) • Kristen Wiig (Ruffnut) • T. J. Miller (Tuffnut) • Gerard Butler (Stoick) • Craig Ferguson (Gobber) • Cate Blanchett (Valka) • Kit Harington (Eret) • F. Murray Abraham (Grimmel) • David Tennant (Spitelout)

Shows: Nolan North (Stoick) • Chris Edgerly (Gobber) • David Faustino (Dagur) • Alfred Molina (Viggo) • Mark Hamill (Alvin) • Susanne Blakeslee (Ingrid) • Edie Mirman (additional voices)

See also
Locations: BerkItchy ArmpitHidden World

Objects: Hiccup's ShieldInfernoDragon EyeDragon Eye IIBlue Oleander
Crew: Dean DeBloisChris SandersBonnie ArnoldAlessandro CarloniDavid SorenJennifer Yuh NelsonJohn Powell