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56-476: Evening Sun may refer to: a sunflower variety That Evening Sun , a novel That Evening Sun (film) The Evening Sun , the evening edition of The Baltimore Sun The Evening Sun , the evening edition of New York's The Sun launched in 1887 Hanover Evening Sun , Hanover, Pennsylvania Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with

112-599: A clade from wild populations from the Great Plains , which indicates that there was a single domestication event in central North America. Following the cultivated sunflower's origin, it may have gone through significant bottlenecks dating back to ~5,000 years ago. In the 16th century the first crop breeds were brought from America to Europe by explorers. Domestic sunflower seeds have been found in Mexico, dating to 2100 BCE. Native American people grew sunflowers as

168-399: A pulvinus below their inflorescence . A pulvinus is a flexible segment in the leaf stalks (petiole) of some plant species and functions as a 'joint'. It effectuates leaf motion due to reversible changes in turgor pressure which occurs without growth. The sensitive plant's closing leaves are a good example of reversible leaf movement via pulvinuli. Generally, each floret is oriented toward

224-452: A tropical climate . However, by adopting a certain angle away from the solar angle, this is prevented. The trumpet shape of these flowers thus acts as a parasol shading the gynoecium at times of maximum solar radiation , and not allowing the rays to impinge on the gynoecium . In the case of sunflowers , a common misconception is that sunflower heads track the Sun across the sky throughout

280-426: A circular angle, where 55 and 144 are Fibonacci numbers) and gives a close packing of florets. This model has been used to produce computer generated representations of sunflowers. The sunflower genome is diploid with a base chromosome number of 17 and an estimated genome size of 2,871–3,189 million base pairs . Some sources claim its true size is around 3.5 billion base pairs (slightly larger than

336-605: A crop from Mexico to Southern Canada. They then were introduced to the Russian Empire , where oilseed cultivators were located, and the flowers were developed and grown on an industrial scale. The Russian Empire reintroduced this oilseed cultivation process to North America in the mid-20th century; North America began their commercial era of sunflower production and breeding. New breeds of the Helianthus spp. began to become more prominent in new geographical areas. During

392-511: A domestic setting. Being easy to grow and producing spectacular results in any good, moist soil in full sun, they are a favourite subject for children. A large number of cultivars, of varying size and color, are now available to grow from seed. The following are cultivars of sunflowers (those marked agm have gained the Royal Horticultural Society 's Award of Garden Merit ):- Sunflower "whole seed" (fruit) are sold as

448-464: A fixed (and typically easterly) direction throughout the day. This old misconception was disputed in 1597 by the English botanist John Gerard , who grew sunflowers in his famous herbal garden: "[some] have reported it to turn with the Sun, the which I could never observe, although I have endeavored to find out the truth of it." The uniform alignment of sunflower heads in a field might give some people

504-410: A single large flower head atop an unbranched stem. 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). Sunflower leaves are broad, coarsely toothed, rough and mostly alternate; those near the bottom are largest and commonly heart-shaped . The plant flowers in summer. What is often called

560-415: A snack food, raw or after roasting in ovens, with or without salt and/or seasonings added. Sunflower seeds can be processed into a peanut butter alternative, sunflower butter . It is also sold as food for birds and can be used directly in cooking and salads. Native Americans had multiple uses for sunflowers in the past, such as in bread, medical ointments, dyes and body paints. Sunflower oil, extracted from

616-441: A substitute for kerosene due to shortages. The light from such a lamp has been described as "miserable" and "smoky". The cake remaining after the seeds have been processed for oil is used as livestock feed. The hulls resulting from the dehulling of the seeds before oil extraction can also be fed to domestic animals. Some recently developed cultivars have drooping heads. These cultivars are less attractive to gardeners growing

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672-617: A sunflower ever since. In 2020, world production of sunflower seeds was 50 million tonnes, led by Russia and Ukraine , with 53% combined of the total. Researchers have analyzed the impact of various nitrogen-based fertilizers on the growth of sunflowers. Ammonium nitrate was found to produce better nitrogen absorption than urea , which performed better in low-temperature areas. Sunflower cultivation typically uses crop rotation , often with cereals , soybean , or rapeseed . This reduces idle periods and increases total sunflower production and profitability. In today's market, most of

728-474: A widespread cooking ingredient. With time, the bulk of industrial-scale production has shifted to Eastern Europe, and (as of 2020 ) Russia and Ukraine together produce over half of worldwide seed production. Sunflowers grow best in fertile, moist, well-drained soil with heavy mulch . They often appear on dry open areas and foothills. Outside of cultivation, the common sunflower is found on moist clay-based soils in areas with climates similar to Texas. In contrast,

784-424: Is a species of large annual forb of the daisy family Asteraceae . The common sunflower is harvested for its edible oily seeds , which are often eaten as a snack food . They are also used in the production of cooking oil, as food for livestock, as bird food , and as a plantings in domestic gardens for aesthetics. Wild plants are known for their multiple flower heads, whereas the domestic sunflower often possesses

840-680: Is often used as a symbol of green ideology . The flower is also the symbol of the Vegan Society . The sunflower is the symbol behind the Sunflower Movement , a 2014 mass protest in Taiwan . The Hidden Disabilities Sunflower was first used as a visible symbol (typically worn on a lanyard) in May 2016 at London Gatwick Airport . It has since come into common usage throughout the UK and in

896-595: Is the national flower of Ukraine . Ukrainians used sunflower as a main source of cooking oil instead of butter or lard forbidden by the Orthodox Church when observing Lent . They were also planted to serve as bioremediation in Chernobyl . In June 1996, U.S., Russian, and Ukrainian officials planted sunflowers at the Pervomaysk missile base where Soviet nuclear weapons were formerly placed. During

952-607: The Commonwealth more generally. Heliotropism The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium , meaning "sun turn". The Greeks assumed it to be a passive effect, presumably the loss of fluid on the illuminated side, that did not need further study. Aristotle's logic that plants are passive and immobile organisms prevailed. In

1008-480: The Russian invasion of Ukraine , a video widely shared on social media showed a Ukrainian woman confronting a Russian soldier, telling the latter to "take these seeds and put them in your pockets so at least sunflowers will grow when you all lie down here". The sunflower has since become a global symbol of resistance, unity, and hope. The sunflower is also the state flower of the U.S. state of Kansas and one of

1064-562: The human genome ). In the binomial name Helianthus annuus , the genus name is derived from the Greek ἥλιος : hḗlios 'sun' and ἄνθος : ánthos 'flower'. The species name annuus means 'annual' in Latin. The plant was first domesticated in the Americas. Sunflower seeds were brought to Europe from the Americas in the 16th century, where, along with sunflower oil , they became

1120-452: The " flower " of the sunflower is actually a "flower head" ( pseudanthium ), 7.5–12.5 centimetres (3–5 in) wide, 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 of fused petals of an asymmetrical ray flower. They are sexually sterile and may be yellow, red, orange, or other colors. The spirally arranged flowers in

1176-721: The 18th century, the use of sunflower oil became very popular in Russia, particularly with members of the Russian Orthodox Church , because only plant-based fats were allowed during Lent , according to fasting traditions . In the early 19th century, it was first commercialized in the village of Alexeyevka in Voronezh Governorate by the merchant named Daniil Bokaryov, who developed a technology suitable for its large-scale extraction, and quickly spread around. The town's coat of arms has included an image of

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1232-412: The 19th century, however, botanists discovered that growth processes in the plant were involved, and conducted increasingly in-depth experiments. A. P. de Candolle called this phenomenon in any plant heliotropism (1832). It was renamed phototropism in 1892, because it is a response to light rather than to the sun, and because the phototropism of algae in lab studies at that time strongly depended on

1288-906: The San Andres dig site. The earliest known examples in the US of a fully domesticated sunflower have been found in Tennessee , and date to around 2300 BCE. Other very early examples come from rockshelter sites in Eastern Kentucky. Many indigenous American peoples used the sunflower as the symbol of their solar deity , including the Aztecs and the Otomi of Mexico and the Incas in South America. In 1510, early Spanish explorers encountered

1344-654: The Western United States and Canada. The information published by the Biota of North America Program (BONAP) largely agrees with this, showing the common sunflower as native to states west of the Mississippi, though also listed as a noxious weed in Iowa, Minnesota, and Texas. Regardless of its original range, it can now be found in almost every part of the world that is not tropical, desert, or tundra. One of

1400-566: The better-known three sisters combination of corn , beans , and squash . Annual species are often planted for their allelopathic properties. It was also used by Native Americans to dress hair. Among the Zuni people , the fresh or dried root is chewed by the medicine man before sucking venom from a snakebite and applying a poultice to the wound. This compound poultice of the root is applied with much ceremony to rattlesnake bites. However, for commercial farmers growing other commodity crops,

1456-412: The brightness (positive phototropic for weak light, and negative phototropic for bright light, like sunlight). A botanist studying this subject in the lab, at the cellular and subcellular level, or using artificial light, is more likely to employ the more abstract word phototropism , a term which includes artificial light as well as natural sunlight . The French scientist Jean-Jacques d'Ortous de Mairan

1512-418: The bud stage is rotated 180°, the bud will be turning away from the sun for a few days, as resynchronization with the sun takes time. When growth of the flower stalk stops and the flower is mature, the heliotropism also stops and the flower faces east from that moment onward. This eastward orientation allows rapid warming in the morning, and as a result, an increase in pollinator visits. Sunflowers do not have

1568-433: The center of the head are called disk flowers . These mature into fruit (sunflower "seeds"). The prairie sunflower ( H. petiolaris ) is similar in appearance to the wild common sunflower; the scales in its central disk are tipped by white hairs. A common misconception is that flowering sunflower heads track the Sun across the sky. Although immature flower buds exhibit this behaviour, the mature flowering heads point in

1624-579: The city flowers of Kitakyūshū , Japan. During the late 19th century, the flower was used as the symbol of the Aesthetic Movement . The sunflower was chosen as the symbol of the Spiritualist Church , for many reasons, but mostly because of the (false) belief that the flowers turn toward the sun as "Spiritualism turns toward the light of truth". Modern Spiritualists often have art or jewelry with sunflower designs. The sunflower

1680-414: The false impression that the flowers are tracking the Sun. This alignment results from heliotropism in an earlier development stage, the young flower stage, before full maturity of flower heads ( anthesis ). Young sunflowers orient themselves in the direction of the sun. At dawn, the head of the flower faces east and moves west throughout the day. When sunflowers reach full maturity, they no longer follow

1736-500: The first sunflowers grew out of Earth Woman's legs after she died giving birth to her twin sons , Sapling and Flint . The Zuni people use the blossoms ceremonially for anthropic worship. Sunflowers were also worshipped by the Incas because they viewed it as a symbol for the Sun. Stories of Clytie the nymph who was spurned by her former lover Helios end with her transformed into what may be translated as sunflower. However,

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1792-408: The flower head. A model for the pattern of florets in the head of a sunflower was proposed by H. Vogel in 1979. This is expressed in polar coordinates where θ is the angle, r is the radius or distance from the center, and n is the index number of the floret and c is a constant scaling factor. It is a form of Fermat's spiral . The angle 137.5° is related to the golden ratio (55/144 of

1848-415: The flowers as ornamental plants , but appeal to farmers, because they reduce bird damage and losses from some plant diseases . Sunflowers also produce latex , and are the subject of experiments to improve their suitability as an alternative crop for producing hypoallergenic rubber. Traditionally, several Native American groups planted sunflowers on the north edges of their gardens as a "fourth sister" to

1904-482: The heavy metal(s) through the roots, which gradually accumulate in other areas, such as the shoots and leaves. Helianthus annuus can also be used in rhizofiltration to neutralize radionuclides , such as caesium-137 and strontium-90 from a pond after the Chernobyl disaster . A similar campaign was mounted in response to the Fukushima Daiichi nuclear disaster . According to Iroquois mythology ,

1960-582: The hormone gibberellin and does not display heliotropic behavior. Plants treated with an external application of the hormone display a temporary restoration of elongation growth patterns. This growth pattern diminished by 35% 7–14 days after final treatment. Hybrid male sterile and male fertile flowers that display heterogeneity have a low crossover of honeybee visitation. Sensory cues such as pollen odor, diameter of seed head, and height may influence pollinator visitation of pollinators that display constancy behavior patterns. Sunflowers are grown as ornamentals in

2016-474: The hypocotyls of juvenile sunflower seedlings while heliotropic bending in the shoot apex does not start occurring until the later developmental stages of the plant, showing a difference between these two processes. The flower of the sunflower preserves the final orientation of the bud, thus keeping the mature flower facing east. Leaf heliotropism is the solar tracking behavior of plant leaves. Some plant species have leaves that orient themselves perpendicularly to

2072-404: The light cycle is interrupted. Tropical convolvulaceous flowers show a preferred orientation, pointing in the general direction of the sun but not exactly tracking the sun. They demonstrated no diurnal heliotropism but strong seasonal heliotropism. If solar tracking is exact, the sun’s rays would always enter the corolla tube and warm the gynoecium , a process which could be dangerous in

2128-412: The major threats that sunflowers face today is Fusarium , a filamentous fungus that is found largely in soil and plants. It is a pathogen that over the years has caused an increasing amount of damage and loss of sunflower crops, some as extensive as 80% of damaged crops. Downy mildew is another disease to which sunflowers are susceptible. Its susceptibility to downy mildew is particularly high due to

2184-443: The morning light and then follow the sun as the day progresses. During the night, the flowers may assume a random orientation, while at dawn they turn again toward the east where the Sun rises. The motion is performed by motor cells in a flexible segment just below the flower, called a pulvinus . The motor cells are specialized in pumping potassium ions into nearby tissues, changing their turgor pressure . The segment flexes because

2240-413: The motor cells at the shadow side elongate due to a turgor rise . This is considered to be turgor-mediated heliotropism. For plant organs that lack pulvini, heliotropism can occur through irreversible cell expansion producing particular growth patterns. This form of heliotropism is considered to be growth-mediated. Heliotropism is a response to light from the Sun. Several hypotheses have been proposed for

2296-463: The next by approximately the golden angle , 137.5°, producing a pattern of interconnecting spirals , where the number of left spirals and the number of right spirals are successive Fibonacci numbers . Typically, there are 34 spirals in one direction and 55 in the other; however, in a very large sunflower head there could be 89 in one direction and 144 in the other. This pattern produces the most efficient packing of seeds mathematically possible within

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2352-418: The occurrence of heliotropism in flowers: In general, flower heliotropism could increase reproductive success by increasing pollination , fertilization success, and/or seed development, especially in the spring flowers. Some solar tracking plants are not purely heliotropic: in those plants the change of orientation is an innate circadian motion triggered by light, which continues for one or more periods if

2408-463: The plant in Greek mythology may be, "partly pale and partly red, and very like a violet". The plant described also exhibits heliotropism , with its face turning towards the sun. This plant may be a species in the genus heliotrope ( Heliotropium ). However, less commonly it is identified as the common marigold ( Calendula officinalis ). During the 19th century, it was believed that nearby plants of

2464-667: The related Helianthus debilis and Helianthus petiolaris are found on drier, sandier soils. The precise native range is difficult to determine. According to Plants of the World Online (POWO), it is native to Arizona, California, and Nevada in the present-day United States and to all parts of Mexico except the Gulf Coast and southeast. Though not giving much detail, the Missouri Botanical Garden Plant Finder also lists it as native to

2520-584: The seeds, is used for cooking , as a carrier oil and to produce margarine and biodiesel , as it is cheaper than olive oil . A range of sunflower varieties exist with differing fatty acid compositions; some "high-oleic" types contain a higher level of monounsaturated fats in their oil than even olive oil. The oil is also sometimes used in soap. After World War I , during the Russian Civil War , people in Ukraine used sunflower seed oil in lamps as

2576-503: The species would protect a home from malaria. The flowers are the subject of Vincent van Gogh 's Sunflowers series of still-life paintings. In July 2015, viable seeds were acquired from the field where Malaysia Airlines Flight 17 crashed on a year earlier and were grown in tribute to the 15 Dutch residents of Hilversum who were killed. Earlier that year, Fairfax chief correspondent Paul McGeough and photographer Kate Geraghty had collected 1.5 kg of sunflower seeds from

2632-415: The sun and continuously face east. Young flowers reorient overnight to face east in anticipation of the morning. Their heliotropic motion is a circadian rhythm, synchronized by the sun, which continues if the sun disappears on cloudy days or if plants are moved to constant light. They are able to regulate their circadian rhythm in response to the blue-light emitted by a light source. If a sunflower plant in

2688-412: The sunflower in the Americas and carried its seeds back to Europe. Of the four plants known to have been domesticated in eastern North America and to have become important agricultural commodities, the sunflower is currently the most economically important. Research of phylogeographic relations and population demographic patterns across sunflowers has demonstrated that earlier cultivated sunflowers form

2744-524: The sunflower seeds provided or grown by farmers are hybrids. Hybrids or hybridized sunflowers are produced by cross-breeding different types and species, for example cultivated sunflowers with wild species. By doing so, new genetic recombinations are obtained ultimately leading to the production of new hybrid species. These hybrid species generally have a higher fitness and carry properties or characteristics that farmers look for, such as resistance to pathogens. Hybrid, Helianthus annuus dwarf2 does not contain

2800-566: The sunflower's way of growth and development. Sunflower seeds are generally planted only an inch deep in the ground. When such shallow planting is done in moist and soaked earth or soil, it increases the chances of diseases such as downy mildew. Another major threat to sunflower crops is broomrape , a parasite that attacks the root of the sunflower and causes extensive damage to sunflower crops, as high as 100%. In commercial planting, seeds are planted 45 cm ( 1 + 1 ⁄ 2  ft) apart and 2.5 cm (1 in) deep. Common sunflower

2856-496: The title Evening Sun . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Evening_Sun&oldid=904781506 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Sunflower The common sunflower ( Helianthus annuus )

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2912-474: The whole life cycle. The uniform alignment of the flowers does result from heliotropism in an earlier development stage, the bud stage, before the appearance of flower heads. The apical bud of the plant will track the Sun during the day from east to west, and then will quickly move west to east overnight as a result of the plant's circadian clock. The buds are heliotropic until the end of the bud stage, and finally face east. Phototropic bending can be catalyzed in

2968-662: The wild sunflower is often considered a weed. Especially in the Midwestern US, wild (perennial) species are often found in corn and soybean fields and can decrease yields. The decrease in yield can be attributed to the production of phenolic compounds which are used to reduce competition for nutrients in nutrient-poor growing areas of the common sunflower. Helianthus annuus can be used in phytoremediation to extract pollutants from soil such as lead and other heavy metals, such as cadmium , zinc , cesium , strontium , and uranium . The phytoremediation process begins by absorbing

3024-551: The wreck site for family and friends of the 38 Australian victims, who aimed to give them a poignant symbol of hope. On 13 May 2021, during the National Costume competition of the Miss Universe 2020 beauty pageant, Miss Dominican Republic Kimberly Jiménez wore a "Goddess of Sunflowers" costume covered in gold and yellow rhinestones that included several real sunflowers sewn onto the fabric. The sunflower

3080-612: Was one of several plants cultivated by Native Americans in prehistoric North America as part of the Eastern Agricultural Complex , which also included corn, beans, squash, and a variety of other crops. Although it was commonly accepted that the sunflower was first domesticated in what is now the southeastern US, roughly 5,000 years ago, there is evidence that it was first domesticated in Mexico around 2600 BCE. These crops were found in Tabasco, Mexico , at

3136-569: Was one of the first to study heliotropism when he experimented with the Mimosa pudica plant. The phenomenon was studied by Charles Darwin and published in his penultimate 1880 book The Power of Movement in Plants , a work which included other stimuli to plant movement such as gravity, moisture and touch. Heliotropic flowers track the Sun's motion across the sky from east to west. Daisies or Bellis perennis close their petals at night but open in

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