Asia is the origin of the hazelnut tree, and many of the varieties still in use today date to the nineteenth century. Spain ranks third globally with a production of 700,000t, with Catalonia being the most significant cultural region. Asia Minor is where the hazelnut is from. Chinese manuscripts were uncovered mentioning this fruit from 5,000 years ago. It was spread by the Greeks and Romans across Europe, where it has been used for many years and is still in use today. 
In the nineteenth century, when hybridization and the selection of species were of considerable interest, many of the cultivars that are today grown were acquired. Turkey, Italy, Spain, and the United States have been the top producers in recent years, with an estimated global output of between 650 and 700,000 metric tons. The modern term for filberts comes from European mythology. The day that the nut harvesting season began, August 22, also known as Saint Philbert's Day (Saint Filbert), was related to the original name. Famous Roman historian Pliny said that Romans frequently plucked 'hazels' (filberts) for food. Pliny believed that hazelnuts (filberts) came from Damascus, Syria, where they naturally grew in forests; nevertheless, 5,000-year-old fossilized hazelnut remains were discovered during Chinese archaeological digs. Almond trees may now be observed growing wild in many countries in Asia and Europe. Near moist soils and large bodies of water, like the Mediterranean Sea's borders surrounding Sicily and Italy and the Black Sea's borders surrounding Turkey, there, winters are mild and summers are chilly. In 1737, Robert Prince established the first industrial nursery in the country in Flushing, New York. Immediately following his election as the first president of the United States in the spring of 1789, George Washington made a river barge trip to this nursery. Armed soldiers were deployed by General Washington during the American Revolution to protect this priceless nursery, which contained both native American filbert trees and imported "Barcelona" filbert trees from Spain. 
Under Thomas Jefferson's presidency, Lewis and Clark explored the Pacific Northwest and brought back specimen plants for Prince Nursery's use in research, propagation, and stocking up for sales. Professor of horticulture and pomology at Cornell University, Dr. MacDaniels developed a sizable nut orchard in Ithaca, New York, where he carried out considerable filbert and hazelnut research. Since antiquity, filberts have allegedly been used as "diving rods" to find underground water springheads, buried treasure, minerals, and ores, as well as various remedies for a wide range of ailments and maladies. Some cult members claim that filberts contain strange properties. The most common and profitable filbert tree in the world is the Corylus avellana L., often known as the European hazelnut tree. In current markets, it is well-known and extensively accessible. After the lower branches of this European filbert tree are clipped, it grows to a height of 20 feet in orchards. There, orchardists estimate that it takes three years for filbert trees to start producing nuts, and an adult tree typically yields 20 to 25 pounds of nuts each year. Nut production depends on cross-pollination between two different types of trees. Although filberts (hazelnuts) do not come loose from their shell until six weeks after they have dried, the maturing nuts have a dark chocolate brown hue. 
The acorn-sized nuts, which can grow in clusters of up to 12, are normally mature during the last week of August and are harvested during the last week of September. While filberts are manually picked for commercial markets in Europe, they are mechanically gathered in nut orchards in Washington State and Oregon. According to historical writing, the American filbert, or "Corylus americana Walt.," grows as a shrub amid natural forests. However, by chopping off its bottom limbs, the plant may be trained to develop into a little tree that can reach heights of up to 12 feet. Zones 3 to 9, from Maine south to Georgia and west to Missouri and Oklahoma, benefit from the filbert tree's great winter hardiness, which allows it to survive temperatures as low as minus 30 degrees Fahrenheit. American filbert (hazelnut) tree clusters often reproduce through division. The American filbert is extremely shade resistant and may thrive in areas with light intensities as low as 1% along streams, forests, meadows, and forest edges. This aggressive tree can regenerate from large, woody rhizomes that extend about six inches into the ground. As early as its second year, the tree can produce nuts. Filberts are eaten by mammals, animals, quail, deer, and large birds. Along with being canned as pure hazelnuts or mixed nuts for sale during Halloween, Thanksgiving, and Christmas, filbert kernels are used in cereals, confections, candies, and cakes. 
Additionally, filbert hazelnuts may be eaten raw, used to flavor recipes, and ground into flour to make bread that resembles a cake. According to one report from the University of Georgia farm, the experimental orchard's trees' filbert (hazelnut) crop has reached maturity. The production of filbert hazelnuts is dominated by Europe and the Middle East; 75–80% of the world's nuts are made in orchards along Turkey's Black Sea border. A further 15% of filberts are produced in Italy and Sicily, while 2% of the market is accounted for by Washington State and Oregon. Many people need to reduce their risk of heart disease for health reasons. The FDA noted that "consuming just 1.5 ounces of hazelnuts daily may lessen the risk of cardiovascular disease" as part of a diet low in saturated fat and cholesterol. Researchers at a hospital in Boston, Massachusetts found that men who ate nuts twice or more a week had a 47% lower risk of sudden cardiac (heart attack) mortality and a 30% lower risk of dying from coronary heart disease.
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