Bradford was supposed to be seedless and sterile ... So, a wild population of pear trees can come from a landscape planting of multiple cultivars or even from a single grafted tree.

Fortunately, most plants sold for landscape specimens are cultivars that are both seedless and thornless. But even these improved cultivars frequently drop small- to medium-size branches in high winds ...

Take, for instance, the classic Thompson seedless. When left to its own devices ... wrote about "girdling stems," shoving metal pegs into pear trees and other ways of "punishing plants" to ...

At low temperatures the fruits may be seeded or seedless, according to whether the flowers have been pollinated or not. Mr. A. G. Brown has related the phenology of apple and pear trees to the ...

Geneticists get to the core of seedless apples. Conventional breeders ... Molecular genetics in any form of tree is difficult and time-consuming, not least because trees grow slowly.