Source: Marc De Vos
The hazel tree (Corylus avellana) is most commonly seen as a shrub, but also as a low tree. The heart-shaped leaves are hairy at the top and bottom. There are both male and female flowers on one shrub. The females are only fertilized by the pollen of other shrubs. So, for one hazelnut, at least two hazel trees are needed. The nuts are often used in chocolate. They consist of more than 50% fatty oil and vitamins.
Fossil hazelnuts have been found in soil layers more than 40 million years old.
The hazel tree can also spread without hazelnuts: if a branch or trunk falls over, it takes root and continues to grow, a few metres from the mother tree. That's called making 'depositors'.
Source: Agentschap voor Natuur en Bos
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