K. Sax
Apricot trees can be dwarfed by budding them on Prunus tomentosa or Prunus Besseyi, but the bud take on P. tomentosa is often poor and the P. Besseyi rootstock suckers freely.

We have had promising results by budding peach on P. tomentosa and the following year budding the peach with apricot. Several cultivars of apricot are budded on each peach whip to ensure cross pollination. These trees are now three years old and less than a meter tall. They blossomed adundantly this spring and should produce fruit this summer.

Sax, K. (1968). DWARFING ROOTSTOCKS FOR APRICOTS. Acta Hortic. 11, 365-372
DOI: 10.17660/ActaHortic.1968.11.34

Acta Horticulturae