Pyrus calleryana Aristocrat

For soil, sun and pruning Aristocrat follows the ornamental pear page, which gives the Missouri Plant Finder's culture for every form: a tree for full sun, happiest in a moist, humus-rich loam that drains, and able to take heavy clay. The Plant Finder gives Aristocrat USDA zones 5 to 9, and the NC State toolbox gives the species the same; no reference read for this page gives an Australian climate zone.

The Plant Finder gives Aristocrat better structural strength than some other callery cultivars such as Bradford, though it is still susceptible to limb breakage or splitting from strong winds, snow or ice, and the NC State toolbox's cultivar list gives it stronger crotches. Both references list it as susceptible to fire blight, the disease the toolbox says can spread to other rose-family crops such as pears, apples and loquat. The Plant Finder adds that viable seed can be produced when Callery pear cultivars cross-pollinate, and that the species is a listed noxious weed in one or more Midwestern states.

The Missouri Plant Finder suggests Aristocrat as a street tree and a small shade tree, as a group or a specimen, and says its "symmetrically attractive narrow shape" makes it a good selection for a variety of sites. No reference read gives a planting centre; the HortOS tree planting guide says to space trees for their mature canopy, which the Plant Finder gives as 6.1 to 7.6 m wide for this form. Where the site is narrow, the Plant Finder gives Capital as a narrow column and Cleveland Select, which it describes as Chanticleer, as a tight narrow pyramid, both with smaller spreads than Aristocrat's. The HortOS street tree guide does not name this form; the species page carries the guides' figures for the forms they list.

The table above shows the sizes growers list. The HortOS guide on specifying and procuring trees covers the standard, the clause and the inspection for a street or park order. Stock crossing a state border travels under the state and territory biosecurity rules. The drawbacks the references give: fire blight, to which both American references list it as susceptible, and limb breakage or splitting in strong winds, snow or ice, by the Missouri Plant Finder.