Helianthus Annuus Seeds (Sunflower Seeds)

Helianthus Annuus Seeds (Sunflower Seeds)

The Helianthus annuus is a coarse, hairy, leafy, fast-growing annual, which produces numerous 3 to 6 inch flower heads on branching stems.
Grouped product items
Product Name Qty
15+ Helianthus Annuus Seeds (Sunflower Seeds)
100 Helianthus Annuus Seeds (Sunflower Seeds)
500 Helianthus Annuus Seeds (Sunflower Seeds)
Availability: In stock
Helianthus Annuus
Helianthus annuus is known as the classic sunflower, Kansas Sunflower or Mirasol and is a native to the Americas in the Asteraceae family, with a large flowering head (inflorescence). The term "sunflower" is also used to refer to all plants of the genus Helianthus, many of which are perennial plants. The Helianthus annuus is a coarse, hairy, leafy, fast-growing annual, which produces numerous 3 to 6 inch flower heads on branching stems and should not be confused with the many large hybrid sunflowers used in bird seed. The stem of the flower can grow as high as 3 meters tall. The plant takes 90-110 days to mature and they bloom in the summer season. The heads and plants are very large in cultivated forms. The flower head (golden-yellow rays with dark brown disks) reaches up to 30 cm in diameter with the "large" seeds. The stem has showing hairs, and these hairs make the stems feel extremely coarse. The green leaves are also coarse. Sunflowers plants are prolific breeders and you can expect this plant to produce at least hundreds of seeds! Hardiness zones :3-9, (-37c/-35f, -5c/25f).This plant is easily grown in average, moist, well-drained soils in full sun. Classic Sunflower tolerates poor soils that are on the dry side. To grow well, the sunflowers need full sun. In commercial planting, seeds are planted 45 cm (1.5') apart and 2.5 cm (1") deep. Irrigation is required until they become established. Sunflowers are cultivated as ornamentals or garden plants, where the blooms are cherished for their beauty and the seeds can be eaten by both humans and wildlife. Game birds, songbirds, and rodents eat the large, nutritious seeds of sunflowers. These attractive weedy plants are of outstanding value to wildlife in the prairies and other parts of the West.
More Information
Common name Sunflower
Species Helianthus annuus
Germination Wild sunflowers can be slow to germinate, and they benefit from cold-moist stratification. Sow outdoors 2-3 weeks before the last frost date. Sow in fall in mild winter areas. Or sow the seeds indoors, in moist peat moss, and put them in a plastic bag, then refrigerate for 3 weeks. Once they germinate and can be manipulated, transplant them outside.

When sowing outside, first prepare the seedbed, then sprinkle seeds thinly and evenly on the surface and rake them in lightly, carefully covering them with soil and firm. Label each row and water gently but thoroughly with a fine spray. To prevent overcrowding, the seedlings usually need to be thinned. Water the newly establishing seedlings fairly frequently until the roots have developed. Support is required for the sunflower stems.

Notes: What is usually called the flower is actually a head (formally composite flower) of numerous flowers (florets) crowded together. The outer flowers are the ray florets and can be yellow, maroon, orange, or other colors, and are sterile. The florets inside the circular head are called disc florets. The disc florets mature into what are traditionally called "sunflower seeds", but are actually the fruit (an achene) of the plant. The true seeds are encased in an inedible husk.

Sunflowers in the bud stage exhibit heliotropism. At sunrise, the faces of most sunflowers are turned towards the east. Over the course of the day, they move to track the sun from east to west, while at night they return to an eastward orientation. This motion is performed by motor cells in the pulvinus, a flexible segment of the stem just below the bud. As the bud stage ends, the stem stiffens and the blooming stage is reached. Now the stem is frozen, typically in an eastward orientation. The stem and leaves lose their green color. The wild sunflower typically does not turn toward the sun; its flowering heads may face many directions when mature. However, the leaves typically exhibit some heliotropism.
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