High evergreen hedges: characteristics
To achieve high evergreen hedges plants with shrubby habit can be used that can reach considerable heights: belonging to different species, these shrubs have in common different characteristics on the basis of which it is possible to create covering and protective barriers. Many of these plant species abundantly exceed ten meters in height and show a marked resistance to pests, diseases and low temperatures; their leaves, generally small in size, are characterized by an elongated shape and an intense green color. Thanks to the density of their thick foliage, these plants form compact and strongly shielding hedges that limit visibility and soften noise; moreover, their solid and robust structure creates a formidable protection against wind and weather.
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The most widespread species
These types of hedges are generally composed of cypresses, yews, oaks and eucalyptus trees. These plants, more than ten meters high and characterized by a very robust structure, are particularly suitable for the creation of windbreak fences and hedges; thanks to their marked resistance to frost and disease, moreover, they survive well even in conditions of intense cold and do not require special care. Among the most widespread species, a prominent place is occupied by the Leyland cypress: this plant is especially appreciated for its fast growth and for its marked resistance to pests, pollution and drought. Its thick and large foliage forms compact barriers that can be used both in the garden and in an urban space. Another shrub widely used for the creation of hedges of elevated height is the eucalyptus: characterized by a height that exceeds twenty meters, this tree is also well suited to damp soils and is very appreciated as an ornamental plant.
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The ideal soils for making them are dry and well-drained: it is therefore important to plant them on a light substrate, composed of soil mixed with sand or other material. This system allows optimal irrigation of the roots while avoiding harmful water stagnation. To compose the hedge, the plants must be positioned at a distance of about one meter from each other: this arrangement ensures optimal growth, because it allows the foliage to expand in full freedom and to create a homogeneous and compact "wall". Watering must be frequent and abundant only in the first year after planting: subsequently, the shrubs will be able to provide for their own water needs. Hedges of high height are usually composed of plant species that do not require constant pruning: once or twice a year it is sufficient to remove the dried or damaged parts, making cuts that are not too drastic for the sole purpose of stimulating thickening of the foliage.
The evergreen hedges they stand out for their marked resistance to diseases and pest attacks: however, there are special cases in which plants can be infected with fungal diseases. Too abundant and frequent irrigations or excessively heavy and humid soils can in fact cause water stagnation harmful for the roots and for the general health of the shrubs, causing rottenness or cancers. The "basal rot" is a rather common disease among conifers: caused by a fungus that infests the root structure, it manifests itself with a yellowing of the leaves and leads to a gradual deterioration of the plant. In the presence of strong humidity, one high hedge formed from cypresses of Leyland is particularly exposed to the onset of "cypress cancer", a fungus that attacks the twigs and leaves causing total desiccation. In both cases, the remedy consists of scrupulous prevention: it is necessary to reduce the frequency of irrigation and disinfect all work tools. Aphids and cochineals, on the other hand, can be easily eradicated with targeted chemicals.