Water needs

Larch is a tree that can reach up to 45 meters in height. It resists very cold climates, in fact its preferred climate is the Alpine one, while it tolerates very little excessively hot climates: in fact, if grown in the Italian plains or hills, the larch will not be able to grow due to the typically hot summers that characterize these territories. Plants that have already been planted for a long time resist very well even long periods of drought, as long as they have very deeply developed roots (therefore able to take liquid water even during winter frosts). For young plants, however, it is advisable to implement various irrigation interventions, especially in summer, in order to create a humid environment. L’

Required care

Being a tree that develops mainly in the wild, the larch does not require special care by man. It prefers environments with a very high humidity rate (between 80 and 90%), exposed for many hours to sunlight but at the same time very ventilated to avoid burns; it fears water stagnation, cause of root rot, therefore it is necessary to plant it in a soil that is compact, deep but also well draining. Due to its large size, up to 45 meters in height and 2 meters in diameter, it must be placed about 3 meters away from other plants, with which it could easily compete for the resources of the land. To favor the expansion of the foliage, it is advisable to prune the most bulky or damaged branches.

How much fertilizer

The young specimens are to be planted preferably in spring, when the climatic conditions are ideal, and they are to be fertilized using ternary mature manure (containing nitrogen, phosphorus and potassium in similar proportions) with slow release; the fertilizer must be planted at the foot of the trunk and must contribute to making the soil draining and compact. Adult larch trees should not be fertilized, except occasionally, due to their rusticity. In fact, it is advisable to carry out a fertilization intervention once every 3 years or so, between the end of autumn and the beginning of winter (to ensure further protection to the tree during winter frosts). Also in this case, the most suitable type of fertilizer is mature manure, but the use of earthworm humus is equally indicated.

Larch: Diseases and pests

Larch, naturally resistant to attack by pathogens, can become vulnerable in the presence of humid and hot climates. The different fungi that can attack the larch spread very quickly, and can also contaminate nearby plants; to avoid the spread of the infection it is possible to carry out an anti-parasite treatment before the arrival of the heat, but if a tree is infected it is advisable to uproot it. Among the parasites that attack the tree there is also the larch tortress, which reproduces between May and July and feeds on more or less young needles, creating serious damage to the foliage. The larch twister can be eradicated thanks to the use of a bacterial strain, namely Bacillus thuringiensis subspecies kurstaki, which inhibits the growth of larvae.

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