Question: plants born from a seed
Good morning, I delight in making sprout every type of fruit seed I eat. Now on my terrace I have a grapefruit seedling, an apple seedling, an avogado seedling ... waiting for them to grow, I ask you a question: do plants born in this way, from a seed, bear fruit or need to be grafted? and possibly how and when? thanks Eleonora
Answer: plants born from a seed
all the fruit plants that we find in the orchard are hybrids, and so also the fruits, both those that give you the neighbor, and those you find in the supermarket, were originated from hybrid plants; in the case of apple and grapefruit, consider that man has been cultivating these fruits for millennia, and therefore, over the centuries, they have been re-bred more and more times. Grapefruit is a hybrid, born so long ago, which now has the characteristics of a species. From the seeds of a hybrid, a wild plant is usually obtained; unfortunately from wild plants it is not possible to predict what fruits you will get; in the case of the apple, it is probable that you get a small fruit tree, perhaps with very small apples and a sharp taste; in the case of grapefruit, it is easy to happen what happens often with citrus fruits: a tree completely incapable of flowering, and therefore of bearing fruit. If then your wild grapefruit will make flowers, they will probably be bitter oranges. As for the avocado, persea americana or persea gratissima, although it is a plant that for us Europeans is a "novelty", they are also cultivated for centuries in Mexico, and the fruit varieties originate from trees grafted with hybrid varieties; if your avocado will bear fruit, it probably won't be of great quality. However, he considers that the avocado plant is of tropical origin, and therefore in Italy it usually develops on the coasts, or in any case in areas with a favorable winter climate; if you are forced to keep your avocado in the greenhouse during the winter, the chances of it flowering are still low. And in general, if your plants will always remain in pots tomorrow, perhaps it would be appropriate to renounce the grafting, given that with great probability they would never produce large quantities of fruit.
If at least you want to try to get even a few fruits, the grafts are practiced in late winter, when the night temperatures are quite high, above 12-15 ° C. The problem for you will be finding the slips, because it is not easy to find grapefruit and avocado grafts in Italy.