The hazelnut is the nut of the hazel and therefore includes any of the nuts deriving from species of the genus Corylus, especially the nuts of the common hazel (Corylus avellana).

Hazelnut is also known as filbert. Name probably originates from the St. Philibert day, celebrated on the August 22, when harvest of hazelnuts usually starts. Some researchers claim that name "filbert" refers to the "full beard" or leafy capsule that completely covers long-husked varieties of hazelnuts.

It also is known as cobnut or filbert nut according to species.

There are 14 to 18 species of hazel. The nuts of all hazels are edible.

In 1995, evidence of large-scale Mesolithic nut processing, some 9,000 years old, was found in a midden pit on the island of Colonsay in Scotland. The evidence consists of a large, shallow pit full of the remains of hundreds of thousands of burned hazelnut shells.

Hazelnuts have a rich lore, and many myths surround them. References to them abound in ancient Greek and Roman writings and mythology and in the Bible, where they are mentioned for their nutritional and healing power.

Ancient Greeks used hazelnuts in treatment of cough and baldness.

There are different types of hazelnuts across the world, including in Europe, Asia and North America.

The plants range from 3 to 36 meters (10 to 120 feet) in height.

Hazelnuts are rich source of mono-unsaturated fatty acids (type of heart-friendly fatty acids), dietary fibers, vitamins A, E and folic acid (B9) and minerals such as manganese, magnesium, phosphorus and iron.

The leaves are deciduous, rounded, 6–12 cm (2.5-5) in long and across, softly hairy on both surfaces, and with a double-serrate margin.

Oil extracted from the hazelnuts is used as vegetable oil for cooking. This oil also has application in cosmetic and pharmaceutical industry and in aromatherapy.

The flowers are produced very early in spring, before the leaves, and are monoecious with single-sex wind-pollinated catkins. Male catkins are pale yellow and 5–12 cm (2-5 in) long, while female catkins are very small and largely concealed in the buds with only the bright red 1–3 mm (0.004-0.12 in) long styles visible.

Harvest of hazelnuts usually takes place from September to October. Mature nuts fall to the ground. They can be collected manually or with a help of specially designed machine called sweeper which works like a vacuum cleaner.

The fruit is a nut, produced in clusters of one to five together, each nut held in a short leafy involucre (“husk”) which encloses about three quarters of the nut. The nut is roughly spherical to oval, 15–20 mm (0.6-0.8 in) long and 12–25 mm (0.5-1.0 inch) broad, yellow-brown with a pale scar at the base. The nut falls out of the involucre when ripe, about 7–8 months after pollination.

Fruit of hazelnut is a nut covered with leafy capsule. Hazelnuts are produced in clusters. Hard outer shell protects oval to spherical, yellowish-brown kernel hidden inside. Each tree produces 20 to 25 pounds of hazelnuts per year.

Hazelnuts are harvested annually in mid-autumn. As autumn comes to a close, the trees drop their nuts and leaves. Most commercial growers wait for the nuts to drop on their own, rather than using equipment to shake them from the tree. The harvesting of hazelnuts is performed either by hand or, by manual or mechanical raking of fallen nuts.

Once harvested, the nuts are dried, cleaned and sent to the cracking plant where they are sorted, cracked, shelled, calibrated, selected and then packed.

The sweet-tasting, cream-colored kernel is small and round, with a pointed tip. Its thin, dark brown skin is faintly bitter, so some people like to remove this before eating.

Hazelnuts can be consumed as snack, or as an ingredient of numerous sweet and salty dishes and industrial candies. Nutella is popular industrial cream made of hazelnuts.

Ancient Romans used torches made of branches of hazelnut during the wedding ceremonies due to belief that hazelnut ensures long, happy and prospective marriage.

Hazelnut is wind-pollinated plant. Wind carries pollen to the female flowers during the winter. Pollen remains dormant 7 to 8 months (until the May or June), when fruit starts to develop.

There are 628 calories in 100 grams (3.5 ounces) of hazelnuts.

Hazelnuts contain vitamins, minerals, protein, fiber and healthy fats.

Particularly in high amounts are protein, dietary fiber, healthy fats, vitamin E, thiamin, phosphorus, manganese, and magnesium. Several B vitamins like riboflavin, thiamin, niacin, pyridoxine, and pantothenic acid have appreciable content. In lesser, but still significant amounts are vitamin K, calcium, zinc, and potassium.

Some of the health benefits of hazelnuts include their ability to balance cholesterol levels, increase heart health, reduce blood pressure and clots, boost the immune system, aid in weight loss, help manage diabetes, improve digestive function, optimize the body’s metabolism, increase skin health, prevent cancer, increase cognitive function, protect against viral and fungal infections, and increase red blood cell count.

Hazelnut is monoecious plant which means that individual male and female flowers develop on the same tree. Male flowers are yellow catkins. Female flowers are tiny and red colored.

The main hazelnut producing countries are: Turkey, Italy, USA, Azerbaijan and Georgia. In the United States, Oregon accounted for 99% of the nation’s production.

Hazelnuts are used in confections to make pralines, chocolate truffles, hazelnut paste products and combination with chocolate.

Ferrero SpA, the maker of Nutella and Ferrero Rocher, uses 25% of the global supply of hazelnuts. The hazelnuts used in Nutella originate from Turkey and Italy, grown mainly by small holders.

Hazelnut has green, rounded leaves that are doubly toothed on the edges. Both sides of leaves are covered with fine hairs.

In the United States, hazelnut butter is being promoted as a more nutritious spread than its peanut butter counterpart, though it has a higher fat content.

In Austria and especially in Vienna, hazelnut paste is an important ingredient in the world famous torts (such as Viennese hazelnut tort) that are made there.

Hazelnut is perennial plant that is able to bear fruit even after the age of 50 years.

Hazelnut is popular as a coffee flavoring, especially in the form of hazelnut latte.

Vodka-based hazelnut liqueurs, such as Frangelico, are also increasing in popularity.

Hazelnut is a small tree that usually grows 20 to 40 feet in height.

Hazels also offer many values for the ecosystem. They provide a nutritious food for animals, such as squirrels and birds, who also serve as dispersal agents for reproduction of the plants.

A number of cultivars of the common hazel and filbert are grown as ornamental plants in gardens.

748.000 metric tons of hazelnuts are produced each year. Nearly 75% of globally consumed hazelnuts originate from Turkey.

Hazelnuts are used as flavoring agents of coffee and various alcoholic ("frangelico" liqueur) and non-alcoholic drinks.

Divining rods were made out of Y-shaped hazel tree branches to locate underground springs, buried treasure, and minerals and ores.

In ancient Roman times, it was a custom to donate hazel plants to bring happiness. It was the same in France where the plant was given as a wedding gift to symbolise fertility.

Greek physicians would recommend crushed hazelnuts to cure coughs and the common cold.

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