Pyrus calleryana x pyrifolia NCPX1 Javelin

Grow it in full sun in most well-drained garden soils, by the NC State toolbox, the page of the university that bred it. The toolbox says that once established it is resistant to urban pollution, heat and drought, and that it is resistant to fire blight, the disease its species entry says can affect Pyrus calleryana and spread to other rose-family crops. The columnar shape, strong leader and tight branching that resist breakage are what the toolbox describes; it gives no pruning instruction, and this page adds none.

The toolbox says to watch for aphids, scale and pear mites, and lists powdery mildew, leaf spot, rust and pear scab as possible diseases. A sparse amount of small fruit can be produced if a suitable pollinator is nearby. The toolbox gives no hardiness zone, frost figure or growth rate for this form and does not say whether it has thorns, and no other reference was read for it, so this page gives none.

The NC State toolbox says Javelin will tolerate streetscapes, car parks and narrow planting strips, and suggests it as a street or urban tree, for narrow spaces, or as a specimen or accent. No reference read gives a planting centre; the HortOS tree planting guide says to space trees for their mature canopy, which the toolbox gives as 3 m wide. The ornamental pear's own named forms, Capital and Aristocrat among them, have their own pages with the Missouri Plant Finder's figures, and the HortOS street tree guide, which does not name Javelin, is quoted on the species page.

Javelin is sold under its trade name with the cultivar name 'NCPX1', and growers' lists carry the cross, Pyrus calleryana x pyrifolia, beside it. The table above shows the sizes growers list. The HortOS guide on specifying and procuring trees covers the standard, the clause, including a single leader where one is specified, and the inspection. Stock crossing a state border travels under the state and territory biosecurity rules. Its size figures are the breeding university's own page's, and no independent reference read for this page gives others.