Inconnu - Inadequate information on toxicity found.
Source: US Fish and Wildlife Service
Plant Names
Helianthus giganteus
Giant Sunflower
Hélianthe géant
Synonyms
swamp sunflower
tall sunflower
soleil géant
Plant Characteristics
Couleur de floraison: Jaune
Bloom Period: Jul - Sep
Hauteur max: 8,0 feet
Max Width: 4,0 feet (spreads by rhizome)
Light Condition:
Plus de 6 heures d'ensoleillement par jour
More than 2 or 3 hours but less than 6 hours of direct sun a day
Soil conditions:
Tolerates medium soil condition
Plus de 6 heures d'ensoleillement par jour
More than 2 or 3 hours but less than 6 hours of direct sun a day
Tolerates medium soil condition
Lifespan:
Vivace
des plantes qui reviennent année après année
Gardener Experience:
Ne se propage pas de manière incontrôlable
Spreads by rhizome
Facile à germer
Self-seeding
Ne se propage pas de manière incontrôlable
Spreads by rhizome
Facile à germer
Self-seeding
Landscape Uses:
No landscape information available.
Ecological Benefits:
Supports birds
Butterfly host
Bee host
Keystone species
Supports birds
Butterfly host
Bee host
Keystone species
Tolerates:
Tolerates limestone conditions
Tolerates juglone conditions
Tolerates limestone conditions
Tolerates juglone conditions
Special Features and Considerations:
Seed and plant distribution status
No seeds available for this plant.
Nous acceptions les semences de cette plante
Faits intéressants
Giant Sunflower is a very tall plant and combined with its purplish stems and vibrant yellow blooms, it is sure to make a visibly impressive addition to a garden. It may not be appropriate for small spaces. Its seeds are eaten by small rodents, and its leaves are eaten by other mammals. The stems are so tall and robust that they have been used by beavers in building their dams and shelters.
Plant Location
Distribution according to VASCAN
Ephemeral
Native
Introduced
Excluded
Extirpated
Doubtful
Absent
Canadensis
Thrives in Ecozones
- Maritime de l'Atlantique
- Plaines boréales
- Bouclier boréal
- Plaines à forêts mixtes
Ecological Benefits
Butterflies Supported by Helianthus giganteus
-
Chlorochlamys chloroleucaria
Blackberry looper - Arpenteuse des ronces -
Euplexia benesimilis
American Angle Shades -
Phragmatobia fuliginosa
Ruby Tiger - Écaille Cramoisie
Specialized Bees Supported by Helianthus giganteus
- Andrena aliciae
- Andrena chromotricha
- Andrena helianthi
- Complexe Colletes americanus
- Dianthidium simile
- Megachile inimica
- Megachile pugnata
- Melissodes agilis
- Melissodes denticulatus
- Melissodes illatus
- Melissodes trinodis
- Perdita pallidipennis
Complementary Plants
- Lobelia spicata
Pale-spike Lobelia
Lobélie à épi - Solidago rigida
Stiff Goldenrod
Verge d'or rigide - Sorghastrum nutans
Yellow False-sorghum
Faux-sorgho penché - Symphyotrichum novae-angliae
New England Aster
Aster de Nouvelle-Angleterre - Teucrium canadense
Canada Germander
Germandrée du Canada
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: Couvrir très légèrement
- Sow by March
- Stratification duration: 30 days
- Self-seeding
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 1/4 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
- No harvesting video available at this time.
Toxicity Notes
Inadequate information on toxicity found.