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Annual Sunflowers. The sunflower we all grew up drawing is Helianthus annuus or the annual sunflower.Breeders have been working with this species for years. Selections range from the dwarf ...
Here's exactly when to plant sunflowers—plus, how to keep pesky chipmunks away. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
You can continue to plant every few weeks up until early to mid-summer for a longer harvest time. But if you plant too late in your hardiness zone, your sunflowers won't mature before the first frost.
It is a perennial herbaceous plant up to 2.5 m (8.2 ft) tall, spreading by means of underground rhizomes. The leaves are long but very narrow, up to 21 cm (8.3 in) long, but rarely more than 1.2 cm (half an inch) wide. One plant usually produces 6-15 flower heads, each containing 10-20 yellow ray florets surrounding 50 or more red disc florets. [4]
Helianthus (/ ˌ h iː l i ˈ æ n θ ə s /) [3] is a genus comprising around 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 .
Helianthus petiolaris is a North American plant species in the family Asteraceae, commonly known as the prairie sunflower [2] or lesser sunflower. [3] Naturalist and botanist Thomas Nuttall was the first to describe the prairie sunflower in 1821. [4] [5] The word petiolaris in Latin means, “having a petiole”. [5]