Giant Sunflower

(Helianthus giganteus)

Giant Sunflower (Helianthus giganteus)

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Estimated Native Range
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Summary

Helianthus giganteus, commonly known as Giant Sunflower, is a deciduous perennial herb native to a variety of habitats including moist meadows, riverbanks, and open woodlands in the Eastern United States and Canada. It can reach a height of 6-8 feet (1.8-2.4 meters) and a width of 2-3 feet (0.6-0.9 meters), with a tall, erect form that stands out in the landscape. The plant is characterized by its large, showy yellow flowers that bloom in late summer to fall, attracting pollinators such as bees and butterflies.

Giant Sunflower is valued for its height and vibrant flowers, which make it a striking addition to wildflower gardens, naturalized areas, and as a backdrop in perennial borders. It is relatively easy to maintain, tolerating a range of soil conditions, though it prefers moist, well-drained soils. Full sun is essential for optimal growth and flowering. While generally pest-free, it can be susceptible to powdery mildew in humid conditions. This species is not typically aggressive in the garden, but it can self-seed prolifically if seed heads are not removed.CC BY-SA 4.0

Plant Description

  • Plant Type: Herb
  • Height: 6-8 feet
  • Width: 2-3 feet
  • Growth Rate: Rapid
  • Flower Color: Yellow
  • Flowering Season: Summer, Fall
  • Leaf Retention: Deciduous

Growth Requirements

  • Sun: Full Sun
  • Water: Medium, High
  • Drainage: Fast, Medium

Common Uses

Bee Garden, Bird Garden, Butterfly Garden, Deer Resistant, Drought Tolerant, Edible*Disclaimer: Easyscape's listed plant edibility is for informational use. Always verify the safety and proper identification of any plant before consumption., Low Maintenance, Rabbit Resistant, Showy Flowers, Water Garden

Natural Habitat

Moist meadows, riverbanks, and open woodlands

Other Names

Common Names: Indian-Potato , Giant Sunflower , Swamp Sunflower , Riesen-Sonnenblume , Hélianthe Géant , Soleil Géant

Scientific Names: Helianthus giganteus , Helianthus giganteus subsp. giganteus , Helianthus giganteus var. giganteus , Helianthus giganteus subsp. alienus , Helianthus subtuberosus , Helianthus giganteus var. subtuberosus , Helianthus nuttallii var. subtuberosus , Helianthus borealis , Helianthus alienus , Helianthus angustifolius subsp. giganteus

GBIF Accepted Name: Helianthus giganteus L.