Hazelnuts come from a tree. 
Hazelnuts grow on trees. 
Hazelnuts are small nuts that grow on trees. They come from trees in a group called Corylus. Some people call them cobnuts or filberts. A hazelnut has a smooth shell. A soft husk covers the shell while it grows. The nut falls out of the husk when it is ripe. The seed inside is the part we eat. You can eat it raw or roasted. People also grind it into a paste.
People use hazelnuts in many tasty ways. They are in breakfast cereals like muesli. They are used to make chocolate treats. You might find them in chocolate bars or Nutella. In Italy, people mix them with chocolate to make pralines.
Farmers work hard to grow these nuts. In Turkey, many hazelnuts are grown. Turkey made the most hazelnuts in 2023. In the United States, most grow in Oregon. During harvest, many nuts fall to the ground. Farmers use machines to collect them. One machine is called a sweeper. It moves nuts into rows so they can be picked up. 
Hazelnuts are tasty nuts that come from trees in the Corylus group.
Growing these nuts involves many careful steps. A hazelnut starts inside a soft, fibrous husk. When the nut is ripe, it falls out of that husk. The nut itself has a smooth shell and an edible seed inside. Some farmers use a method called brutting to help the tree. They snap the tips of new shoots to help the tree make more flowers. In the autumn, the nuts fall to the ground. Farmers often wait for this to happen naturally instead of shaking the trees. 
People have been enjoying hazelnuts for a very long time. About 8,000 years ago, people in Scotland were already processing them. Scientists found a large pit on the island of Colonsay filled with burned shells. This discovery shows that ancient communities likely planned together to harvest them. It also suggests these people might have had a mostly vegetarian diet. In the United Kingdom, some people call these nuts cobnuts. This name comes from an old word for a head. Children used to play a game hitting each other's heads with nuts on strings.
Today, many countries work hard to grow hazelnuts for the whole world. In 2023, Turkey was the largest producer of all. They produced 57.7% of the world's total hazelnut supply.
Hazelnuts are part of many different cultures and stories. They appear in famous poems and plays by writers like William Shakespeare. In his play Romeo and Juliet, a shell is used as a tiny chariot. They are also important in many types of cooking around the world. For example, people in Austria use hazelnut paste to make delicious tortes. In France, a cake called Dacquoise uses hazelnut meringue. Whether they are in a snack or a fancy dessert, hazelnuts are a special part of our food world.
The hazelnut is the edible fruit of trees within the genus Corylus.
A hazelnut begins its life as a seed protected by a fibrous outer husk. The nut is roughly spherical or oval, whereas a variety called a filbert is more elongated. About seven to eight months after pollination, the nut becomes ripe and falls from its husk. The edible seed inside features a thin, dark brown skin. Depending on the specific cultivar, the nut can make up between 33.2% and 49.5% of the total fruit. Cultivars grown near the Mediterranean Sea often have the highest nut-to-fruit ratio.
Commercial growers use specific methods to manage these trees and increase yields. One traditional technique is called brutting, which helps the tree produce more flower buds. To do this, farmers snap the tips of new shoots at the end of the growing season. In Europe, many orchards use a multi-trunk growing system. However, some producers graft a desired variety, called a scion, onto a Corylus colurna rootstock to create a single-trunk tree. This makes it easier to use large machinery in the orchard. Some farmers also use silvopastoral systems, where animals like pigs live among the trees to fertilize the soil.
Harvesting is a precise process that usually takes place in mid-autumn.
Human history with the hazelnut stretches back thousands of years. In 1995, archaeologists found evidence of large-scale nut processing on the island of Colonsay in Scotland. They discovered a midden pit containing hundreds of thousands of burned hazelnut shells. These shells were radiocarbon dated to approximately 7720 years old. This massive find suggests that Mesolithic communities engaged in organized, communal harvesting. Because large game was scarce on the island, these people likely relied on a largely vegetarian diet. Similar ancient sites have also been found in Surrey, England, and on the Isle of Man.
Today, the hazelnut industry is a massive global operation. In 2023, the world produced 1.13 million tonnes of hazelnuts in their shells. Turkey was the leading producer, accounting for 57.7% of the total global supply. Italy and the United States are also major contributors to the market. In the United States, production is concentrated almost entirely in the Willamette Valley of Oregon. The nuts are incredibly nutritious, containing high levels of protein, dietary fiber, and vitamin E. They are also a significant source of monounsaturated fats, specifically oleic acid.
Culturally, the hazelnut appears in many famous works of art and literature. In the play Romeo and Juliet, William Shakespeare describes a hazelnut shell as a chariot for the fairy Queen Mab. The poet John Keats also used the fruit as a metaphor in his poem "To Autumn." In the culinary world, the nut is essential for making pralines and chocolate truffles. In Italy, the combination of ground hazelnuts and chocolate led to the creation of Nutella. From French Dacquoise cakes to Turkish churchkhela, the hazelnut remains a versatile and beloved part of human culture.
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