Helianthus giganteus, commonly known as the Giant Sunflower, is a perennial herbaceous plant characterized by its tall stature and large, showy flowers.
The plant typically grows between 6 to 10 feet (1.8 to 3 meters) in height, with a thick, sturdy stem.
Leaves are lance-shaped, arranged alternately along the stem, and can grow up to 12 inches (30 centimeters) in length.
The flower heads are bright yellow with dark brown centers, measuring about 4 to 6 inches (10 to 15 centimeters) in diameter.
Giant Sunflowers bloom from mid-summer to early fall, attracting pollinators such as bees and butterflies with their abundant nectar.
This species is native to North America and is commonly found in prairies, meadows, and along roadsides.
Known Range:
Helianthus giganteus is native to the eastern United States, ranging from the Midwest to the southeastern states.
Its natural habitat includes areas with moist soil, such as floodplains, marshes, and wetlands.
The species has also been introduced to other regions for ornamental purposes and can be found in gardens and naturalized in certain areas.
Care Requirements:
Light: Giant Sunflowers thrive in full sun and require at least 6 to 8 hours of direct sunlight per day.
Soil: They prefer well-draining soil with medium fertility. Sandy loam or loamy soil types are ideal.
Water: While tolerant of drought once established, regular watering is essential, especially during periods of extended dryness.
Fertilizer: Minimal fertilizer is required, but a balanced, all-purpose fertilizer can be applied during the growing season to promote healthy growth and flowering.
Maintenance: Deadheading spent flowers can prolong blooming and prevent self-seeding. Additionally, providing support for taller varieties may be necessary to prevent them from bending or toppling in windy conditions.
Many of the flowering plants featured on our website are available through Nature Hills Nursery. Ordering them through this link will support the Cernunnos Foundation and your garden!
