You know what it looks like… but what is it called?
TAKE THE QUIZ“malling”
We have one entry that includes the term malling.
Malling rootstock
noun: any of several rootstocks for fruit trees developed by the East Malling Research Station, Kent, England that are propagated vegetatively and used especially for dwarfing apple trees see paradise sense 6
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Merriam-Webster unabridged