Tree hazel, Corylus colurna - Wanted poster, care and cutting


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The tree hazel is not to be confused with the common hazel, because the tree hazel is native to Southeastern Europe and is widespread in the Himalayan region. Visually, in this country, both species hardly differ, only in the fruit is a difference to recognize. The tree hazel has significantly more fruits, but these are surrounded by a much harder shell. It is usually not planted in the garden as a tree for nut harvest, but only for decoration, since the release of the fruit is too expensive. Like the domestic relatives, the tree hazel makes little demands on their location, only a regular pruning is required so that the hazel does not spread uncontrollably.
Characteristics

  • German name: Tree hazel
  • Scientific name: Corylus colurna
  • Family: Birch Family (Betulaceae)
  • Genus: Hazel (Corylus)
  • Flowering period: February to March
  • Flower color: red (female), yellow (male)
  • Fruits: nut fruits
  • Growth height: up to 20 m
  • Hardiness: up to - 20° C
Location
The tree hazel is very undemanding as far as its location. It thrives in the sun as well as in the shade or partial shade. However, in order for it to develop well, it should not be too shady and be planted maximally in a partially shaded spot. When selecting a location, care should be taken not to plant it too close to a property boundary, as it can develop into width without regular pruning. Tip: The tree hazel is a popular park tree and is also suitable in the garden to plant it in company with other trees.
ground
The tree hazel is a survivalist and thrives in almost every location. The substrate may be a normal garden soil. Sandy soils also tolerate it very well, even moist soils are no problem for them. Only permanent wetness does not tolerate it very well, so it should not be planted in close proximity to a pond. The plant substrate can be prepared with humus and a little gravel before planting the tree hazel. Chance of the tree hazel is also found in higher areas with calcareous soil. When adding lime, however, care should be taken to use it sparingly and it should be checked whether the soil is not already slightly calcareous.
Fertilize and water
The tree hazel should only be cast in the first weeks after planting, but no waterlogging should occur. Normally, the tree hazel does not need to be additionally poured over the year, as the normal rain is completely sufficient for them. Only in a very dry summer can the soil be watered around the tree hazel, paying attention to penetrating watering, as the tree forms a deep taproot. Although the tree hazel likes many nutrients, however, normal mulching or a composting in the spring for the nutritional needs is sufficient. Tip: Even in the first few years water regularly, this accelerates the growth of tree hazel.
pruning
Actually, the tree hazel should not be cut, however, is a regular pruning for rejuvenation and to reduce the spread to some extent, indispensable.
  • It is cut in autumn or winter, after most of the fruit has fallen off.
  • A pruning is still possible in early spring, but even before the tree is in the "juice".
  • The interfaces must be professionally closed with tree wax, as it can take years for the wound to close.
  • Do not remove side shoots directly from the trunk, but allow to stand about 10 cm to prevent infection.
  • Dead or diseased parts of plants should be removed on a regular basis.
overwinter
The tree hazel needs no protection in winter and also tolerates strong frost without problems. Only in extreme frost from about -15° C, the strain should be protected from the frost. In addition, the roots of the young trees can be protected in winter with a thick mulch layer. However, the tree must be able to breathe through the winter protection, which is why films or similar materials are unsuitable for protection and may even lead to the death of the tree. Once you have touched the bark and the leaves of the tree hazel, you will quickly notice that they are rough and almost uncomfortable to touch. Therefore, the tree is no special treat even in winter animals and is avoided, which is why it does not need to be protected from game bite.
Diseases and pests
The tree hazel is hardly susceptible to diseases or pests. Only sporadically, fungi can form on the tree, but they can not be dangerous to it. Disturb the appearance, branches can be easily removed, caution is only necessary with mushrooms directly on the main trunk, which are usually not so easy to remove, without damaging the tree. However, the tree fungi fall off again over the years orcan be easily broken off. Occasionally aphids can be found on the tree hazel. If the infestation is not too large, no action must be taken. Only if the lice infestation becomes too strong should suitable pesticides be used. Often, the lice infestation is also due to surrounding ant nests. In this case, the ant nest should first be fought, as otherwise a new infestation with lice may occur rapidly.
Very rarely, the tree hazel can be attacked by the Verticillium wilt. It is a fungal disease that first affects the roots and then the entire tree. Since the infestation is noticed only very late and the disease takes its course from within, no countermeasures can be taken. In this case, the tree can only be felled. In addition, a tree hazel should not be planted again at this location, as this can also be quickly attacked by the fungus again.
frequently asked Questions
  • Is the tree hazel poisonous? - no. The tree hazel is not poisonous like her native relative. Even the fruits could be eaten, but are usually too expensive to dissolve.
  • Can the tree hazel be planted in a natural garden? - Yes. The tree hazel can easily be planted in a natural garden. Their fruits are also eaten by local wild animals such as squirrels, which then, with a bit of luck, can also come into their own garden.
  • Is the tree hazel suitable for a hedge? - no. The tree hazel is not suitable for a hedge, that it should be cut as little as possible. However, the young branches can easily bend into shape, which is why they can be given a direction of growth at least in the first few years.
Worth knowing about the tree hazel shortly
Use of fruits?
  • The nuts are slightly smaller than the common hazel, which is a shrub, and do not taste that good either.
  • Nevertheless, in certain countries, hazel trees are deliberately cultivated and the nuts are mainly used for baking.
  • But also the wood of the tree hazel is valuable. It has a light brown color and is processed into furniture and carvings.
Susceptibility to diseases?
  • A newly planted tree may have difficulty in growing, but when this phase is over, the tree hazel is a robust and rather insensitive tree that is rarely infested with disease or pests and can become several hundred years old.
  • He is absolutely hardy and even a location in a business park does not bother him.
  • Also suitable for the city because it is relatively insensitive to air pollution, there it is used for parks and as an avenue tree.
  • Its main roots go down, causing little damage to paving stones and asphalt in the city.
  • Even a very hot summer, he can stand well and can be planted in a sunny or partially shaded location.
  • It is possible with the tree hazel a fungal infection through which brownish round spots form on the leaves. This mushroom species is not very aggressive and therefore does not need to be fought.
  • In addition, the use of road salt, as in other trees, can cause discoloration of the leaves in the city.

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