There is quite a bit of scope for developing dwarfing rootstocks in much the same way as rootstocks have been bred for apples, though I do not know of anyone who is working in this field. Grafting is best carried out in late winter to early spring, once the sap is rising in the trees but before they come into leaf. I use the whip and tongue method, which works fine for me, but other simpler methods can also be used. So long as you follow a few basic rules, grafting is quite a simple operation and even the complete novice can have good results. That is enough of talking about how to grow the plants.
Lets get onto the best part of the article - the fruit.
This can vary widely from species to species, though the basic structure is always the same. Externally, it is somewhat like a small apple, the thin skin covering a fleshy pulp. The colour of the ripe fruit ranges from yellow, through green to red and on to dark purple. The woody seeds are not apple like, up to five of them are formed at the centre of the fruit and they often stick together in a clump, acting effectively like a cherry stone. Fruit size varies from species to species, with the largest about 1 inches in diameter.