Very kind, my question is this, I planted three kiwi plants two years ago and two males and one male, three years ago a female annoyed me, now neither oh nor 2, these plants branch out well, but the fact is that I don't they have never borne fruit, but not even flowers, some friends wonder, and suppose they are wild plants that should be grafted, the question is when should this be done, if it is the right thing to do and what kind of graft should I do . Best regards and thanks for your reply.
the behavior of your kiwis is definitely strange, but it also seems strange to think that in the nursery they sold you sterile wild kiwis, which do not produce flowers. If you want to try to graft them, the kiwis are grafted at the end of winter, with split graft, or in late spring, with bud grafting. Having said that, before grafting them, be sure to perform the right cultivation care. Given that, in general, a kiwi takes three or four years before flowering, it happens however that adult specimens do not produce any flowers, or produce very few. The reason for this behavior is often due to the pruning practiced at the end of winter, which go to remove future flower buds; because flower buds are prepared already in autumn, or during winter, and a vigorous and indiscriminate pruning, can get to remove them all. Another reason for the lack of flowering is to be found in fertilization: supplying a young kiwi plant with a lot of fertilizer rich in nitrogen, means stimulating the plant to a massive production of leaves, followed by a total or partial absence of flowers. This is because, in essence, the plant uses all its energies to produce a large green foliage, and it no longer remains for the following flowering. So, avoid over-fertilizing your kiwis; if you supply a dose of manure in autumn, in spring choose a granular fertilizer for fruit plants, poor in nitrogen, and rich in phosphorus and potassium.