Toxic Plant Connu comme étant toxique - Toxic to mammals if ingested. A poisonous plant, sneezeweed can trigger adverse responses in individuals who consume significant quantities. Symptoms range from mild to severe, potentially becoming life-threatening. The blossoms, seeds, and foliage all contain toxins. Ingesting the plant may lead to stomach discomfort, excessive salivation, elevated body temperature, throwing up, seizures, and labored breathing.

Plant Names

image of Plante à fleurs
Helenium autumnale
Sneezeweed
Hélénie automnale

Synonyms

fall sneezeweed
mountain sneezeweed
swamp sunflower
hélénie d'automne

Plant Characteristics

Couleur de floraison: Jaune Bloom Period: Aug - Oct
Hauteur max: 4,0 feet
Max Width: 2,0 feet (spreads by rhizome)
Light Condition:
Full sun Plus de 6 heures d'ensoleillement par jour
Part shade More than 2 or 3 hours but less than 6 hours of direct sun a day
Soil conditions:
Moisture medium Tolerates medium soil condition
Lifespan: Vivace des plantes qui reviennent année après année
Gardener Experience:
beginner friendly Suitable for beginner gardeners
plant spread by rhizome Spreads by rhizome
plant germinate easy Facile à germer
plant self seeding Self-seeding
Landscape Uses:
wetland garden Souhaitable dans les jardins de zone humide
rain garden Suitable for rain gardens
container suitable Suitable for container garden
school garden Suitable for school gardens
Ecological Benefits:
butterfly host Butterfly host
Tolerates:
Salt Tolerant Tolerates salt conditions
Deer Resistant Deer resistant
Rabbit Resistant Rabbit resistant
Limestone Tolerant Tolerates limestone conditions
Juglone Tolerant Tolerates juglone conditions
Special Features and Considerations:
causes skin rashes This plant causes skin rashes

Seed and plant distribution status

No seeds available for this plant.
Nous acceptions les semences de cette plante

Faits intéressants

Common Sneezeweed is an adaptable plant that often grows best in open, moist areas such as near ponds and streams. It produces an abundance of vivid, daisy-like blooms in the late summer and early fall. Despite its name, it does not cause seasonal allergies, as its pollen is spread by insects and not in the wind. The name “sneezeweed” comes from an old folkloric tradition where the flowers were dried and sniffed to induce sneezing and release evil spirits; it is, however, poisonous to humans.

Plant Location

Native to Ottawa region: Oui

Distribution according to VASCAN

Distribution: Helenium autumnale
Ephemeral Native Introduced Excluded Extirpated Doubtful Absent

Thrives in Ecozones

  • Maritime de l'Atlantique
  • Plaines boréales
  • Bouclier boréal
  • Maritime du Pacifique
  • Plaines à forêts mixtes

Ecological Benefits

Butterflies Supported by Helenium autumnale

Specialized Bees Supported by Helenium autumnale

No bee data available for this plant.

Complementary Plants

Substitute For Non-Native Plants

  • Leucanthemum (Shasta Daisy)
  • Gerbera (Gerbera Daisy)
  • NA (Non-native False Sunflower)

Sowing Information

Download Seed Envelope Labels (PDF)
  • Sowing depth: Surface sow
  • Sow anytime
  • Stratification duration: 0 days
  • Self-seeding
  • Notes: Can be sown in late spring in warm soil

Harvesting and Seed Sharing

  • Harvest start month: September
  • Harvesting indicator:
    • Seeds easily fall off when you gently pull them off
  • Harvesting:
    • Secouer le porte-graines dans un sac de papier
  • Seed viability test:
    • Pas de test requis avant le don
  • Packaging measure: 1 rounded 1/8 teaspoon
  • Seed storage:
    • Sécher à l'air dans un sac en papier ou contenant ouvert, pour quelques jours jusqu'à sec
    • Secouer de temps à autre pour prévenir la moisissure
  • Cultivar: Yes, do not donate unless you know source, and there are no known cultivars in your garden or at proximity
  • Remove non-seed material
  • Harvesting video: Watch here

Toxicity Notes

Toxic to mammals if ingested. A poisonous plant, sneezeweed can trigger adverse responses in individuals who consume significant quantities. Symptoms range from mild to severe, potentially becoming life-threatening. The blossoms, seeds, and foliage all contain toxins. Ingesting the plant may lead to stomach discomfort, excessive salivation, elevated body temperature, throwing up, seizures, and labored breathing.