A dwarf orange tree, which is touted for its diminutive stature of only eight feet at maturity, is made possible by a dwarfing variety of hardy orange known as Flying Dragon, used as a rootstock.

Source: https://www.dailynews.com/2023/01/21/the-joys-of-a-semi-dwarf-navel-orange-tree-and-other-hardy-citrus-with-winter-fruit/

Because of this, vines grafted onto phylloxera-resistant American rootstock could survive.

Source: https://www.forbes.com/sites/jillbarth/2023/03/24/walking-the-rows-rsonance-vineyard-and-the-fools-errand-plot/

Instead, this technique takes a bud from one tree and inserts it into the stem of the rootstock.

Source: https://www.dailymail.co.uk/sciencetech/article-12598225/Sycamore-Gap-Tree-Scientists-claim-technology-IDENTICAL-copy-felled-tree-Hadrians-Wall.html?ns_mchannel=rss&ns_campaign=1490&ito=1490