Hazelnut
The hazelnut is a small, rounded nut enclosed in a woody shell, wrapped in a leafy husk that opens when ripe. Inside, the crunchy, cream-colored seed is covered by a thin brown skin, offering a sweet, mild, and buttery flavor. Nutritionally, it packs a massive punch, being remarkably rich in monounsaturated fatty acids (mainly oleic acid), Vitamin E, manganese, and dietary fiber, making it an incredibly healthy choice.
Plant name
Aveleira
Family
Betulaceae
Scientific name
Corylus avellana L.
Scientific name for the Common Hazel tree.
Corylus maxima Mill.
Related species, commonly known as the Filbert.
Corylus colurna L.
Related species, commonly known as the Turkish Hazel.
About the fruit
The hazelnut is native to Europe and Western Asia (Turkey is the world's largest producer). The nut is consumed fresh, roasted or, more popularly, processed into pastes (such as Nutella), oils, and bakery products. The high content of monounsaturated fats and Vitamin E makes it an important functional food for cardiovascular health.
Leaves
The leaves of the hazelnut tree are important as a food source for wildlife. In agriculture, the management of foliage and lateral branches is crucial to ensure adequate sun exposure and the quality of flowering and fruiting.
Stem
The hazelnut is a dicotyledonous plant (of the Betulaceae family) with a strong root system, but its trunk (stem) is rarely used for construction lumber due to its size and multi-stemmed habit. The wood is of moderate hardness and is traditionally used for crafts, walking sticks, and tool handles. The trunk and branches are widely used in the formation of hedges (living fences) in agroforestry systems. Growth is vigorous, and management (pruning and thinning of basal stems) is essential to maximize fruit production.
Roots
The fibrous root system and the ability to emit lateral shoots make the hazelnut tree an excellent plant for management in high-density orchards and for use on slopes, where it helps to stabilize the soil.
Seeds
The hazelnut is a seed of high nutritional value and is classified as an oilseed. It is rich in lipids (about 60% to 70% of the seed's weight), predominantly unsaturated fatty acids, with a high concentration of oleic acid (omega-9). It has a high content of proteins (about 12% to 18%), fibers, and is an important source of vitamin E and minerals such as magnesium, copper, and manganese. The pericarp (hard shell) of the nut is studied for containing phenolic compounds with antioxidant potential. The seed is the main product, being consumed fresh or used in the confectionery and oil industries.
Flowers
The fact that the hazelnut tree depends on the wind for pollination (anemophily) and that the male and female flowers mature at slightly different times (dichogamy) means that cross-pollination with another cultivar that produces pollen at a compatible time is essential for a commercial harvest.
Benefits
Heart Health
The high proportion of oleic acid (monounsaturated fatty acid) and phytosterols helps reduce LDL (bad) cholesterol and triglyceride levels.
Potent Antioxidant
It is one of the nuts richest in Vitamin E, which protects cell membranes against oxidative damage.
Bone Health
The high Manganese content is vital for bone metabolism, enzyme formation, and nutrient metabolism.
Nerve Health
Rich in thiamine (Vitamin B1) and folate.
High Fiber Content
Promotes satiety and digestive health.
Curiosities
Industrial Use
The hazelnut is the nut used in the manufacturing of the famous Frangelico liqueur and the Nutella chocolate and hazelnut spread.
Sacred History
The hazelnut tree was considered a sacred tree in many ancient cultures, being a symbol of wisdom and protection.
Winter Flowering
The male catkins (the male floral organ) are the first to appear in winter, generally long before the leaves and female flowers.
Nutritional Relation
The hazelnut is closely related to the peanut in terms of nutritional composition, but belongs to a different botanical family.
References
- 1.Journal of Food Composition and Analysis. Nutritional Composition of Hazelnuts (Corylus avellana L.). 2018. (Detailed nutritional composition).
- 2.Critical Reviews in Food Science and Nutrition. Health benefits of hazelnut consumption: a systematic review and meta-analysis. 2020. (Review on health benefits).
- 3.Scientia Horticulturae. Pollen viability and fertilization in European hazelnut (Corylus avellana). 2013. (Study on pollen viability and fertilization).
- 4.Food Chemistry. Tocopherol, tocotrienol and fatty acid composition of hazelnut varieties. 2016. (Composition of vitamin E and fatty acids).
- 5.Embrapa Temperate Climate. Aveleira: Cultivo e Manejo. (Technical aspects of cultivation).
- 6.Erdogan, V. (2018). Hazelnut (Corylus avellana L.). In Exotic Fruits Reference Guide. Academic Press, p. 195-207. (Academic review on the species, including morphology and composition).
- 7.Çetin, Y. et al. (2017). Characterization of hazelnut (Corylus avellana L.) genotypes based on morphological, biochemical and pomological characteristics. Turkish Journal of Agriculture and Forestry, 41(4), 284-293. (Scientific study of morphological characterization of the plant).
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