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2. Helianthus giganteus - Wikipedia

   en.wikipedia.org/wiki/Helianthus_giganteus

   Helianthus giganteus is a perennial herbaceous plant that can grow up to 4–5 metres (13–16 ft) tall. The leaves are slender and lanceolate. The flower heads are bright yellow, up to 7 cm (3 in) in diameter. They are most commonly found in valleys with wet meadows or swamps [5] [4] and even near river banks.

3. Helianthus annuus 'Russian Giant' - Wikipedia

   en.wikipedia.org/wiki/Helianthus_annuus_'Russian...

   Cultivation. Helianthus annuus 'Russian Giant' can grow in a neutral to alkaline, well-drained moisture, rich in humus, and moderately fertile soil exposed to full sun. A cane might be needed to support the weight of the bloom. It is susceptible to diseases such as sclerotinia diseases and powdery mildews, along with pests such as slugs and ...

4. Helianthus - Wikipedia

   en.wikipedia.org/wiki/Helianthus

   Helianthus ( / ˌhiːliˈænθəs /) [3] is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. [4] [5] Except for three South American species, the species of Helianthus are native to North America and Central America.

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6. Helianthus maximiliani - Wikipedia

   en.wikipedia.org/wiki/Helianthus_maximiliani

   Helianthus maximilianii Schrad. Helianthus maximiliani is a North American species of sunflower known by the common name Maximilian sunflower. [2] This sunflower is named for Prince Maximilian of Wied-Neuwied, who encountered it on his travels in North America. Helianthus maximiliani is native to the Great Plains in central North America, and ...

7. Helianthus grosseserratus - Wikipedia

   en.wikipedia.org/wiki/Helianthus_grosseserratus

   Helianthus instabilis E.Watson. Helianthus grosseserratus, commonly known as sawtooth sunflower or thick-tooth sunflower, [3] is a perennial sunflower in the family Asteraceae, with a large flowering head (inflorescence). The plant may reach 3–12 feet (91–366 cm) in height and is found along streams, damp prairies and roadsides in the ...