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A sunflower seed is a seed from a sunflower (Helianthus annuus). There are three types of commonly used sunflower seeds: linoleic (most common), high oleic, and sunflower oil seeds. Each variety has its own unique levels of monounsaturated, saturated, and polyunsaturated fats. The information in this article refers mainly to the linoleic variety.
Helianthus tuberosus is a herbaceous perennial plant growing to 1.5–3 m (4 ft 11 in – 9 ft 10 in) tall with opposite leaves on the lower part of the stem but alternate towards the top. [7] The leaves have a rough, hairy texture. Larger leaves on the lower stem are broad ovoid-acute and can be up to 30 cm (12 in) long.
The plant flowers in summer. What is often called the " flower " of the sunflower is actually a "flower head" (pseudanthium), 7.5–12.5 centimetres (3–5 in) wide, [ 4 ] of numerous small individual five-petaled flowers (" florets "). The outer flowers, which resemble petals, are called ray flowers. Each "petal" consists of a ligule composed ...
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.
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 ...
But be sure to leave some flower heads to die back naturally, as native birds love sunflower seeds. Zones: 2 to 11 Size: 3 to 10 feet tall x 1.5 to 3 feet wide