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Helianthus agrestis are an annual species that flower in the late summer to early fall months. [5] Helianthus species require a lot of sun to grow. For optimal growth, the plant should get at least 6 hours of full sun a day. [1] Sunflower seeds also contain a toxic substance that will kill all nearby grass. [8]
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 ...
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.
The disk of a sunflower is made up of many little flowers. The ray flowers here are dried In North Carolina A sunflower seed growing. Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 centimetres (120 inches) or more.
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Its leaves are thick and stiff, tending to droop towards the end. The sunflower is perennial, and flowers for about two to three weeks in early October. [5] [6] Schweinitz's sunflower spreads through dispersal of seeds without a dormant period. One plant generally produces 3-6 yellow flower heads.