Mirage:

It would make it easier to advise you if you could tell us whether your pear trees are Asian or European, and, if possible, the varieties. Asian pears are usually more precocious to bloom and bear than Europeans.

Asian pears can begin bearing in year 3 or 4 after planting from bareroot stock, but many European varieties can take 8-10 years before they really start to bear fruit, although they can bloom without fruit set.

I cannot explain why one of your pear trees had a pear on it when you bought it, but it is obviously possible assuming it was a potted tree and at least 3 years old. The source of your trees, the way they came from the nursery, and your location are some facts that could provide useful clues to diagnose your problem, which might be completely normal and not a problem at all.

Application of nitrogen fertilizers will not hasten the fruiting of pears or any other fruit tree. On the contrary, fertilizers can cause bursts of leafy growth that can actually delay fruiting. For most of us with European pears, growing them to the fruiting stage requires a great deal of patience.

Don Yellman, Great Falls, VA