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The pear is frequently raised by sowing the pips (seeds) of ordinary cultivated or of wild kinds, these forming what are known as free or pear stocks, on which the choicer varieties are grafted for increase. Both quince and clonally-produced pear rootstocks are also used for Pyrus communis orchards. For new varieties the flowers can be cross-bred to preserve or combine desirable traits. The fruit of the pear is produced on spurs, which appear on shoots more than one year old.
Three species account for the vast majority of edible fruit production, the European pear Pyrus communis subsp. communis cultivated mainly in Europe and North America, the Chinese white pear (bai li) Pyrus ×bretschneideri, and the Nashi pear Pyrus pyrifolia (also known as Asian pear or apple pear), both grown mainly in eastern Asia. There are thousands of cultivars of these three species. A species grown in western China, P. sinkiangensis, and P. pashia, grown in southern China and south Asia, are also produced to a lesser degree.
Other species are used as rootstocks for European and Asian pears and as ornamental trees. The Siberian pear, Pyrus ussuriensis (which produces unpalatable fruit) has been crossed with Pyrus communis to breed hardier pear cultivars. The Bradford pear (Pyrus calleryana 'Bradford') in particular has become widespread in North America, and is used only as an ornamental tree, as well as a blight-resistant rootstock for Pyrus communis fruit orchards. The willow-leafed pear (Pyrus salicifolia) is grown for its attractive, slender, densely silvery-hairy leaves.