Dating oil paintings

They are remarkably tough and will grow in any kind of soil as long as it is not waterlogged.They do fine in soils that are slightly acidic to somewhat alkaline (p H 6.0 to 7.5).Once sunflowers get started, they can tolerate drought as befits plants whose ancestors grew happily in dry prairie regions.

While they grew abundantly on the Great Plains, sunflowers were first purposely cultivated by Native Americans in the Southwest or Mississippi River valley area as a source of medicine, fiber, seeds, and oil.When the European settlers arrived, they immediately recognized the value of sunflowers and sent seeds back to Europe.There they found a place in English cottage gardens and even Van Gogh's paintings.However, it was in Russia that the sunflower became a major agricultural crop.

They provided a source of oil that could be eaten without breaking church dietary laws. began sustained commercial production of oil seed cultivars to produce vegetable oil.

Early in the 20th Century, Russian growers spearheaded the breeding and selection for disease resistance and high oil content. Long beloved as part of the rural landscape, sunflowers have been embraced by gardeners as an ornamental plant relatively recently.

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