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This towering native plant can reaching 7 feet tall. It’s a hardy perennial in Zones 3-9 and grows well in dry-to-moderate soil moisture. Plant these as a winter sowing or cold stratify them for ...
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.
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 .
The plant has an erect rough-hairy stem, reaching typical heights of 3 metres (10 feet). The tallest sunflower on record achieved 9.17 m (30 ft 1 in). [3] Sunflower leaves are broad, coarsely toothed, rough and mostly alternate; those near the bottom are largest and commonly heart-shaped.
Helianthus giganteus is a perennial herbaceous plant native to the northern United States and southern Canada that can grow up to 1–3 metres (3.3–9.8 ft) tall with instances to 4m (13 feet). The leaves are approximately 1 inch wide by 7 inches long, and partly rough.