Editing Fruit tree propagation (section)

===Pear rootstocks===
[[Pear]]s are usually grafted onto quince rootstocks, which produce small to medium-sized trees. Some varieties, however, are not compatible with [[quince]], and these require double working. This means that a piece of pear graft-work compatible with both the quince rootstock and the pear variety is used as an intermediate between the two. If this is not done the pear and the rootstock could eventually separate at the graft. Varieties that require double working include "Bristol Cross", "Dr Jules Guyot", "Doyenné d' été" and "Williams Bon Chrétien".

* '''Quince C''': Moderately vigorous&nbsp;— Makes a bush pear tree about {{convert|8|to|18|ft|m|abbr=on}} tall, bearing fruit within four to seven years.<ref name="RHS Fruit"/> Suitable for highly fertile soils and vigorous varieties, but not where conditions are poor. Used for bush, cordon and espalier growing. Old stocks of Quince C may be infected with a virus, so care should be taken to obtain certified virus free stock. If in doubt, use Quince A as there is not a great amount of difference in vigor between the two.
* '''Quince A''': Medium vigor&nbsp;— Slightly more vigorous than Quince C, this is the most common variety upon which pears are grafted. Bears fruit between four and eight years, making a tree of some {{convert|10|to|20|ft|m|abbr=on}} in height and spread. Suitable for all forms of pear trees except standards.<ref name="RHS Fruit"/>
* '''Pear stock''': Very vigorous&nbsp;— Pears grafted onto pear rootstocks make very large trees, not suitable for most gardens.