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This form of propagation, particularly used in the cultivation of the apple tree in order to obtain clonal rootstocks, is characterized by the fact that the rooting is artificially induced on the basal knots of the shoots developed from the stem of the mother plant, previously pollarded at ground level.
The rooted cuttings, destined to become layering mother plants, are planted in a nursery sector specifically used for this purpose and allowed to develop freely during the first year of planting.
Just before the vegetative restart of the second year these new mother plants, also called "ceppaie", are subjected to total excision of the aerial part through the pollocking of the stem to be implemented at ground level. From the buds left on the stump stems the shoots originate and when these have reached the length of at least 10 cm we proceed to cover the base with fine earth. This tamping is gradually increased in direct relation to the constant lengthening of the shoots until their basal section is buried for about 20 cm. During the summer, the rhizogenesis starts from the basal nodes; just before the winter rest, but already when the defoliation took place, the shoots are well rooted and suitable to be removed from the mother plant by a cut made below the rooting point. The cuttings thus obtained constitute the clonal rootstocks.
Mother plants, if properly cared for, can provide propagation material even for twenty years.