Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Helianthus giganteus (Giant Sunflower or Tall Sunflower), is a species of Helianthus native to the eastern United States and southeastern Canada, from Nova Scotia and Ontario west to Minnesota and south to Mississippi and Georgia. It is a perennial herbaceous plant growing up to 4 m tall. The leaves are slender, lanceolate. The flower heads are bright yellow, up to 7 cm diameter. They are most commonly found in valleys with wet meadows or swamps.

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