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I have a nut already grown up but that still does not yield very few flowers, should I graft it? because I have the doubt that it is wild
hazelnuts are rustic plants, widespread in Italy even in the wild; to have big hazelnuts with a round stone it is necessary to graft the stones; even if your hazel were wild, it should still produce the typical fruits, even though it may produce small ones, or elongated ones, and not the large Piedmontese hazelnuts that are already shelled in the supermarket.
The lack of flowers could be due to a late pruning, which is carried out precisely during the period in which the flowers are produced: the pits bloom between the end of winter and the beginning of spring; for this reason, pruning is generally practiced later, in late spring, or in autumn. Generally it is pruned simply by removing the smaller and less luxuriant basal suckers, trying to allow the shrub to develop a single stem, or only a few stems (two or three), because otherwise the plant tends to spend all its energies in the development of said suckers.
It happens that the grafted plants bloom a lot but without producing fruit, in this case they are fertility problems, as many varieties of hazel, very common in cultivation, are self-sterile, and tend not to produce fruit if there are no other stones in the area. If, however, yours is a wild kernel, it should be self-fertile, and therefore its flowers should be able to pollinate each other (the core produces male flowers and female flowers).
It also happens that, at the moment in which the flowers wither away, after having been pollinated, and the plant begins to prepare the fruits, the climate is decidedly very dry; in these cases it is important to supply watering to the plant, only when the soil is well dried, to obtain larger and more numerous hazelnuts.